diff --git a/components/admin/tabs/storage.js b/components/admin/tabs/storage.js
index ad8e2045..513a7933 100644
--- a/components/admin/tabs/storage.js
+++ b/components/admin/tabs/storage.js
@@ -3,7 +3,6 @@ import { useState } from "react";
 import Link from "next/link";
 import { bytesToSize } from "../../../components/utils";
 import { deleteAwaitingSubmissionsFromBlob } from "../../../actions/services/documentService";
-import { sendRepCompleteMessage } from "../../../actions/services/portalService";
 import { consoleLogger } from "../../../actions/core/logger";
 
 import { formatBlobDates } from "../utils/adminHelper";
@@ -237,7 +236,8 @@ export default function StorageTab({ data, repCompleteCount }) {
                                                 {folder.repComplete && (
                                                     <button
                                                         onClick={async () => {
-                                                            confirm(
+                                                            if (
+                                                                !confirm(
                                                                 "Do you want resend the rep queue message " +
                                                                     folder.repJsonBlob.name.split(
                                                                         "/"
@@ -246,20 +246,53 @@ export default function StorageTab({ data, repCompleteCount }) {
                                                                     folder.repJsonBlob.name.split(
                                                                         "/"
                                                                     )[1]
-                                                            ) &&
-                                                                (sendRepCompleteMessage(
-                                                                    c.container,
-                                                                    folder.repJsonBlob.name.split(
-                                                                        "/"
-                                                                    )[0],
-                                                                    folder.repJsonBlob.name.split(
-                                                                        "/"
-                                                                    )[1]
-                                                                ),
+                                                                )
+                                                            ) {
+                                                                return;
+                                                            }
+
+                                                            try {
+                                                                const response =
+                                                                    await fetch(
+                                                                        "/api/admin/createrepcompletemessage",
+                                                                        {
+                                                                            method: "POST",
+                                                                            headers:
+                                                                                {
+                                                                                    "Content-Type":
+                                                                                        "application/json"
+                                                                                },
+                                                                            body: JSON.stringify(
+                                                                                {
+                                                                                    container:
+                                                                                        c.container,
+                                                                                    tempcaseref:
+                                                                                        folder.repJsonBlob.name.split(
+                                                                                            "/"
+                                                                                        )[0],
+                                                                                    repid: folder.repJsonBlob.name.split(
+                                                                                        "/"
+                                                                                    )[1]
+                                                                                }
+                                                                            )
+                                                                        }
+                                                                    );
+
+                                                                if (!response.ok) {
+                                                                    throw new Error(
+                                                                        "Unable to recreate representation queue message"
+                                                                    );
+                                                                }
+
                                                                 alert(
                                                                     "rep queue message sent!"
-                                                                ),
-                                                                window.location.reload());
+                                                                );
+                                                                window.location.reload();
+                                                            } catch (error) {
+                                                                consoleLogger(
+                                                                    error
+                                                                );
+                                                            }
                                                         }}
                                                     >
                                                         Recreate Queue Message
diff --git a/pages/api/admin/createrepcompletemessage.js b/pages/api/admin/createrepcompletemessage.js
new file mode 100644
index 00000000..abc5a92b
--- /dev/null
+++ b/pages/api/admin/createrepcompletemessage.js
@@ -0,0 +1,82 @@
+import { createRepCompleteMessage } from "../../../actions/azurestorage";
+import { consoleLogger } from "../../../actions/core/logger";
+import {
+    hasTrustedSameOrigin,
+    readAdminSessionCookie,
+    setAdminAuthNoStore,
+    validateAdminSession
+} from "../../../lib/admin/adminAuth";
+import { respondError, respondSuccess } from "../middleware/apiResponse";
+
+const forbidden = (res) =>
+    respondError(res, {
+        status: 403,
+        code: "FORBIDDEN",
+        message: "Request not permitted"
+    });
+
+const isValidContainer = (value) =>
+    typeof value === "string" &&
+    value.length >= 3 &&
+    value.length <= 63 &&
+    /^[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/.test(value);
+
+const isValidPathSegment = (value) =>
+    typeof value === "string" &&
+    value.length > 0 &&
+    value.length <= 255 &&
+    value === value.trim() &&
+    value !== "." &&
+    value !== ".." &&
+    !/[\\/\u0000-\u001f\u007f]/.test(value);
+
+export default async function handler(req, res) {
+    setAdminAuthNoStore(res);
+    res.setHeader("Allow", "POST");
+
+    if (req.method !== "POST") {
+        return respondError(res, {
+            status: 405,
+            code: "METHOD_NOT_ALLOWED",
+            message: "Method not allowed"
+        });
+    }
+
+    const adminSession = readAdminSessionCookie(req);
+    if (!validateAdminSession(adminSession)) {
+        return forbidden(res);
+    }
+
+    if (!hasTrustedSameOrigin(req)) {
+        return forbidden(res);
+    }
+
+    const { container, tempcaseref, repid } = req.body ?? {};
+    if (
+        !isValidContainer(container) ||
+        !isValidPathSegment(tempcaseref) ||
+        !isValidPathSegment(repid)
+    ) {
+        return respondError(res, {
+            status: 400,
+            code: "INVALID_REQUEST",
+            message: "Invalid request"
+        });
+    }
+
+    try {
+        const data = await createRepCompleteMessage(
+            container,
+            tempcaseref,
+            repid
+        );
+        return respondSuccess(res, data);
+    } catch (error) {
+        consoleLogger(error);
+        return respondError(res, {
+            status: 400,
+            code: "CREATE_REP_COMPLETE_MESSAGE_FAILED",
+            message: "Failed to create representation complete message"
+        });
+    }
+}
\ No newline at end of file
diff --git a/pages/api/file/createrepcompletemessage_api.js b/pages/api/file/createrepcompletemessage_api.js
index bff12c91..94311d16 100644
--- a/pages/api/file/createrepcompletemessage_api.js
+++ b/pages/api/file/createrepcompletemessage_api.js
@@ -1,18 +1,42 @@
-import {
-    getBlobs,
-    createRepCompleteMessage
-} from "../../../actions/azurestorage";
+import { createRepCompleteMessage } from "../../../actions/azurestorage";
 import { hashAPIPath } from "../../../actions/core/hash";
 import { consoleLogger } from "../../../actions/core/logger";
 import { respondError, respondSuccess } from "../middleware/apiResponse";
+import { getSession } from "next-auth/react";
 
-import nextConnect from "next-connect";
-import middleware from "../middleware/middleware";
+const forbidden = (res) =>
+    respondError(res, {
+        status: 403,
+        code: "FORBIDDEN",
+        message: "Request not permitted"
+    });
 
-const ApiProxy = nextConnect();
-ApiProxy.use(middleware);
+const isValidContainer = (value) =>
+    typeof value === "string" &&
+    value.length >= 3 &&
+    value.length <= 63 &&
+    /^[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/.test(value);
+
+const isValidPathSegment = (value) =>
+    typeof value === "string" &&
+    value.length > 0 &&
+    value.length <= 255 &&
+    value === value.trim() &&
+    value !== "." &&
+    value !== ".." &&
+    !/[\\/\u0000-\u001f\u007f]/.test(value);
+
+export default async function handler(req, res) {
+    res.setHeader("Allow", "GET");
+
+    if (req.method !== "GET") {
+        return respondError(res, {
+            status: 405,
+            code: "METHOD_NOT_ALLOWED",
+            message: "Method not allowed"
+        });
+    }
 
-ApiProxy.get(async (req, res) => {
     const containerName = req.query.container;
     const tempCaseRef = req.query.tempcaseref;
     const filename = req.query.repid;
@@ -20,13 +44,13 @@ ApiProxy.get(async (req, res) => {
 
     if (
         typeof containerName === "undefined" ||
-        containerName.length === 0 ||
+        containerName === "" ||
         typeof tempCaseRef === "undefined" ||
-        tempCaseRef.length === 0 ||
+        tempCaseRef === "" ||
         typeof filename === "undefined" ||
-        filename.length === 0 ||
+        filename === "" ||
         typeof checkHash === "undefined" ||
-        checkHash.length === 0
+        checkHash === ""
     ) {
         return respondError(res, {
             status: 400,
@@ -35,6 +59,28 @@ ApiProxy.get(async (req, res) => {
         });
     }
 
+    if (
+        !isValidContainer(containerName) ||
+        !isValidPathSegment(tempCaseRef) ||
+        !isValidPathSegment(filename) ||
+        typeof checkHash !== "string"
+    ) {
+        return respondError(res, {
+            status: 400,
+            code: "INVALID_REQUEST",
+            message: "Invalid request"
+        });
+    }
+
+    const session = await getSession({ req });
+    if (
+        typeof session?.user?.id !== "string" ||
+        session.user.id.length === 0 ||
+        session.user.id !== containerName
+    ) {
+        return forbidden(res);
+    }
+
     const hashCandidatePaths = [
         "/api/file/createrepcompletemessage_api?container=" +
             containerName +
@@ -77,12 +123,10 @@ ApiProxy.get(async (req, res) => {
             message: "Failed to create representation complete message"
         });
     }
-});
+}
 
 export const config = {
     api: {
         bodyParser: false
     }
 };
-
-export default ApiProxy;
diff --git a/tests/phase21/file-handler-contract.test.cjs b/tests/phase21/file-handler-contract.test.cjs
index 6e6a016c..b18ae8a3 100644
--- a/tests/phase21/file-handler-contract.test.cjs
+++ b/tests/phase21/file-handler-contract.test.cjs
@@ -1106,66 +1106,389 @@ test("uploadsinglefile handler dependency failure returns UPLOAD_SINGLE_FILE_FAI
     );
 });
 
-test("createrepcompletemessage handler accepts encoded hash variant", async () => {
+const loadOrdinaryRepCompletion = (overrides = {}) => {
+    const calls = { hash: [], queue: [] };
+    const payload = { messageId: "ordinary-message" };
     const mod = loadModule("pages/api/file/createrepcompletemessage_api.js", {
-        nextConnect: createNextConnectMock(),
-        middleware: () => {},
-        hashAPIPath: (queryPath) =>
-            queryPath.includes("repid=rep%201")
-                ? "&hash=expected"
-                : "&hash=other",
         respondError: respondErrorMock,
         respondSuccess: respondSuccessMock,
+        getSession: async () => ({ user: { id: "user-container" } }),
+        hashAPIPath: (queryPath) => {
+            calls.hash.push(queryPath);
+            return "&hash=expected";
+        },
+        createRepCompleteMessage: async (...args) => {
+            calls.queue.push(args);
+            return payload;
+        },
         consoleLogger: () => {},
-        createRepCompleteMessage: async () => ({ ok: true })
+        ...overrides
     });
 
-    const req = {
-        query: {
-            container: "c1",
-            tempcaseref: "TMP/1",
-            repid: "rep 1",
-            hash: "expected"
-        }
-    };
-    const res = createRes();
-    await mod.default.handler(req, res);
+    return { mod, calls, payload };
+};
 
-    assert.strictEqual(res.state.statusCode, 200);
-    assert.deepStrictEqual(JSON.parse(JSON.stringify(res.state.jsonBody)), {
-        ok: true
-    });
+const ordinaryRepCompletionRequest = (overrides = {}) => ({
+    method: "GET",
+    headers: {},
+    query: {
+        container: "user-container",
+        tempcaseref: "CAS-12345-A1B2C3",
+        repid: "2026-03-18-10:20:30_-_APP_-_Statement_-_Jones_Rob",
+        hash: "expected"
+    },
+    ...overrides
 });
 
-test("createrepcompletemessage handler dependency failure returns CREATE_REP_COMPLETE_MESSAGE_FAILED", async () => {
-    const mod = loadModule("pages/api/file/createrepcompletemessage_api.js", {
-        nextConnect: createNextConnectMock(),
-        middleware: () => {},
-        hashAPIPath: () => "&hash=expected",
-        respondError: respondErrorMock,
-        respondSuccess: respondSuccessMock,
-        consoleLogger: () => {},
-        createRepCompleteMessage: async () => {
+const assertNoCompletionWork = (calls, { noHash = false } = {}) => {
+    assert.strictEqual(calls.queue.length, 0);
+    if (noHash) assert.strictEqual(calls.hash.length, 0);
+};
+
+test("createrepcompletemessage rejects unsupported methods before authorization work", async () => {
+    const loaded = loadOrdinaryRepCompletion();
+    const res = createRes();
+
+    await loaded.mod.default(
+        ordinaryRepCompletionRequest({ method: "POST" }),
+        res
+    );
+
+    assert.strictEqual(res.state.statusCode, 405);
+    assert.strictEqual(res.state.headers.allow, "GET");
+    assert.strictEqual(res.state.jsonBody.error.code, "METHOD_NOT_ALLOWED");
+    assertNoCompletionWork(loaded.calls, { noHash: true });
+});
+
+for (const inputCase of [
+    { name: "missing container", query: { container: undefined } },
+    { name: "invalid container type", query: { container: ["user-container"] } },
+    { name: "malformed container", query: { container: "Invalid_Container" } },
+    { name: "missing case reference", query: { tempcaseref: undefined } },
+    { name: "unsafe case-reference path separator", query: { tempcaseref: "CAS/123" } },
+    { name: "unsafe case-reference traversal segment", query: { tempcaseref: ".." } },
+    { name: "missing representation identifier", query: { repid: undefined } },
+    { name: "unsafe representation path separator", query: { repid: "rep\\file" } },
+    { name: "unsafe representation control character", query: { repid: "rep\u0000file" } }
+]) {
+    test(`createrepcompletemessage rejects ${inputCase.name} before authorization work`, async () => {
+        const loaded = loadOrdinaryRepCompletion();
+        const request = ordinaryRepCompletionRequest();
+        const res = createRes();
+
+        request.query = { ...request.query, ...inputCase.query };
+        Object.keys(request.query).forEach((key) => {
+            if (typeof request.query[key] === "undefined") delete request.query[key];
+        });
+        await loaded.mod.default(request, res);
+
+        assert.strictEqual(res.state.statusCode, 400);
+        assertNoCompletionWork(loaded.calls, { noHash: true });
+    });
+}
+
+for (const sessionCase of [
+    { name: "missing NextAuth session", session: null },
+    { name: "session without user id", session: { user: {} } },
+    { name: "session with empty user id", session: { user: { id: "" } } },
+    { name: "session with non-string user id", session: { user: { id: 123 } } }
+]) {
+    test(`createrepcompletemessage rejects ${sessionCase.name} before HMAC processing`, async () => {
+        const loaded = loadOrdinaryRepCompletion({
+            getSession: async () => sessionCase.session
+        });
+        const res = createRes();
+
+        await loaded.mod.default(ordinaryRepCompletionRequest(), res);
+
+        assert.strictEqual(res.state.statusCode, 403);
+        assertNoCompletionWork(loaded.calls, { noHash: true });
+    });
+}
+
+test("createrepcompletemessage rejects cross-container ownership before HMAC processing", async () => {
+    const loaded = loadOrdinaryRepCompletion({
+        getSession: async () => ({ user: { id: "different-container" } })
+    });
+    const res = createRes();
+
+    await loaded.mod.default(ordinaryRepCompletionRequest(), res);
+
+    assert.strictEqual(res.state.statusCode, 403);
+    assertNoCompletionWork(loaded.calls, { noHash: true });
+});
+
+test("administrative cookie alone cannot authorize ordinary representation completion", async () => {
+    const loaded = loadOrdinaryRepCompletion({ getSession: async () => null });
+    const res = createRes();
+
+    await loaded.mod.default(
+        ordinaryRepCompletionRequest({
+            headers: { cookie: "pedw_admin_session=valid-admin-token" }
+        }),
+        res
+    );
+
+    assert.strictEqual(res.state.statusCode, 403);
+    assertNoCompletionWork(loaded.calls, { noHash: true });
+});
+
+test("previously valid HMAC cannot bypass a missing current ordinary session", async () => {
+    const loaded = loadOrdinaryRepCompletion({ getSession: async () => null });
+    const res = createRes();
+
+    await loaded.mod.default(ordinaryRepCompletionRequest(), res);
+
+    assert.strictEqual(res.state.statusCode, 403);
+    assertNoCompletionWork(loaded.calls, { noHash: true });
+});
+
+for (const hashCase of [
+    { name: "missing HMAC", hash: undefined },
+    { name: "invalid HMAC", hash: "wrong" }
+]) {
+    test(`createrepcompletemessage rejects ${hashCase.name} without queue work`, async () => {
+        const loaded = loadOrdinaryRepCompletion();
+        const request = ordinaryRepCompletionRequest();
+        const res = createRes();
+
+        if (typeof hashCase.hash === "undefined") delete request.query.hash;
+        else request.query.hash = hashCase.hash;
+        await loaded.mod.default(request, res);
+
+        assert.strictEqual(res.state.statusCode, 400);
+        assertNoCompletionWork(loaded.calls);
+    });
+}
+
+test("createrepcompletemessage accepts punctuation and preserves exact identifiers and response", async () => {
+    const loaded = loadOrdinaryRepCompletion();
+    const request = ordinaryRepCompletionRequest();
+    const res = createRes();
+
+    await loaded.mod.default(request, res);
+
+    assert.strictEqual(res.state.statusCode, 200);
+    assert.deepStrictEqual(loaded.calls.queue, [
+        [
+            request.query.container,
+            request.query.tempcaseref,
+            request.query.repid
+        ]
+    ]);
+    assert.deepStrictEqual(
+        JSON.parse(JSON.stringify(res.state.jsonBody)),
+        loaded.payload
+    );
+});
+
+test("createrepcompletemessage preserves encoded HMAC compatibility", async () => {
+    const loaded = loadOrdinaryRepCompletion({
+        hashAPIPath: (queryPath) => {
+            loaded.calls.hash.push(queryPath);
+            return queryPath.includes("repid=rep%20name%20%26%20notes.json")
+                ? "&hash=expected"
+                : "&hash=other";
+        }
+    });
+    const request = ordinaryRepCompletionRequest();
+    request.query.repid = "rep name & notes.json";
+    const res = createRes();
+
+    await loaded.mod.default(request, res);
+
+    assert.strictEqual(res.state.statusCode, 200);
+    assert.strictEqual(loaded.calls.queue.length, 1);
+    assert.strictEqual(loaded.calls.hash.length, 2);
+});
+
+test("createrepcompletemessage dependency failure returns CREATE_REP_COMPLETE_MESSAGE_FAILED", async () => {
+    const loaded = loadOrdinaryRepCompletion({
+        createRepCompleteMessage: async (...args) => {
+            loaded.calls.queue.push(args);
             throw new Error("rep message failed");
         }
     });
-
-    const req = {
-        query: {
-            container: "c1",
-            tempcaseref: "TMP1",
-            repid: "rep1",
-            hash: "expected"
-        }
-    };
     const res = createRes();
-    await mod.default.handler(req, res);
+
+    await loaded.mod.default(ordinaryRepCompletionRequest(), res);
 
     assert.strictEqual(res.state.statusCode, 400);
     assert.strictEqual(
         res.state.jsonBody.error.code,
         "CREATE_REP_COMPLETE_MESSAGE_FAILED"
     );
+    assert.strictEqual(loaded.calls.queue.length, 1);
+});
+
+const loadAdminRepCompletion = (overrides = {}) => {
+    const calls = { noStore: 0, readSession: 0, validate: 0, origin: 0, queue: [] };
+    const payload = { messageId: "admin-message" };
+    const mod = loadModule("pages/api/admin/createrepcompletemessage.js", {
+        respondError: respondErrorMock,
+        respondSuccess: respondSuccessMock,
+        setAdminAuthNoStore: () => {
+            calls.noStore += 1;
+        },
+        readAdminSessionCookie: () => {
+            calls.readSession += 1;
+            return "admin-token";
+        },
+        validateAdminSession: () => {
+            calls.validate += 1;
+            return true;
+        },
+        hasTrustedSameOrigin: () => {
+            calls.origin += 1;
+            return true;
+        },
+        createRepCompleteMessage: async (...args) => {
+            calls.queue.push(args);
+            return payload;
+        },
+        consoleLogger: () => {},
+        ...overrides
+    });
+
+    return { mod, calls, payload };
+};
+
+const adminRepCompletionRequest = (overrides = {}) => ({
+    method: "POST",
+    headers: {
+        origin: "https://portal.example.test",
+        cookie: "pedw_admin_session=admin-token"
+    },
+    body: {
+        container: "selected-user-container",
+        tempcaseref: "CAS-12345-A1B2C3",
+        repid: "2026-03-18-10:20:30_-_IP_-_Statement_-_Smith_Alex_rep.json"
+    },
+    ...overrides
+});
+
+test("admin representation completion rejects unsupported methods before authentication", async () => {
+    const loaded = loadAdminRepCompletion();
+    const res = createRes();
+
+    await loaded.mod.default(adminRepCompletionRequest({ method: "GET" }), res);
+
+    assert.strictEqual(res.state.statusCode, 405);
+    assert.strictEqual(res.state.headers.allow, "POST");
+    assert.strictEqual(loaded.calls.noStore, 1);
+    assert.strictEqual(loaded.calls.readSession, 0);
+    assertNoCompletionWork(loaded.calls);
+});
+
+for (const sessionCase of [
+    { name: "missing administrative session", token: null },
+    { name: "invalid administrative session", token: "invalid-token" },
+    { name: "expired administrative session", token: "expired-token" }
+]) {
+    test(`admin representation completion rejects ${sessionCase.name}`, async () => {
+        const loaded = loadAdminRepCompletion({
+            readAdminSessionCookie: () => sessionCase.token,
+            validateAdminSession: () => false
+        });
+        const res = createRes();
+
+        await loaded.mod.default(adminRepCompletionRequest(), res);
+
+        assert.strictEqual(res.state.statusCode, 403);
+        assert.strictEqual(loaded.calls.origin, 0);
+        assertNoCompletionWork(loaded.calls);
+    });
+}
+
+for (const originCase of [
+    { name: "missing Origin", headers: { cookie: "pedw_admin_session=admin-token" } },
+    {
+        name: "cross-origin request",
+        headers: {
+            origin: "https://attacker.example.test",
+            cookie: "pedw_admin_session=admin-token"
+        }
+    }
+]) {
+    test(`admin representation completion rejects ${originCase.name}`, async () => {
+        const loaded = loadAdminRepCompletion({ hasTrustedSameOrigin: () => false });
+        const res = createRes();
+
+        await loaded.mod.default(
+            adminRepCompletionRequest({ headers: originCase.headers }),
+            res
+        );
+
+        assert.strictEqual(res.state.statusCode, 403);
+        assertNoCompletionWork(loaded.calls);
+    });
+}
+
+for (const inputCase of [
+    { name: "missing container", body: { container: undefined } },
+    { name: "malformed container", body: { container: "Invalid_Container" } },
+    { name: "missing case reference", body: { tempcaseref: undefined } },
+    { name: "unsafe case-reference segment", body: { tempcaseref: "CAS/123" } },
+    { name: "missing representation identifier", body: { repid: undefined } },
+    { name: "unsafe representation segment", body: { repid: "../rep.json" } }
+]) {
+    test(`admin representation completion rejects ${inputCase.name} without queue work`, async () => {
+        const loaded = loadAdminRepCompletion();
+        const request = adminRepCompletionRequest();
+        const res = createRes();
+
+        request.body = { ...request.body, ...inputCase.body };
+        Object.keys(request.body).forEach((key) => {
+            if (typeof request.body[key] === "undefined") delete request.body[key];
+        });
+        await loaded.mod.default(request, res);
+
+        assert.strictEqual(res.state.statusCode, 400);
+        assertNoCompletionWork(loaded.calls);
+    });
+}
+
+test("ordinary NextAuth session alone cannot authorize admin representation completion", async () => {
+    const loaded = loadAdminRepCompletion({
+        readAdminSessionCookie: () => null,
+        validateAdminSession: () => false,
+        getSession: async () => ({ user: { id: "selected-user-container" } })
+    });
+    const res = createRes();
+
+    await loaded.mod.default(adminRepCompletionRequest(), res);
+
+    assert.strictEqual(res.state.statusCode, 403);
+    assertNoCompletionWork(loaded.calls);
+});
+
+test("admin representation completion preserves cross-container identifiers and response", async () => {
+    const loaded = loadAdminRepCompletion();
+    const request = adminRepCompletionRequest();
+    const res = createRes();
+
+    await loaded.mod.default(request, res);
+
+    assert.strictEqual(res.state.statusCode, 200);
+    assert.deepStrictEqual(loaded.calls.queue, [
+        [request.body.container, request.body.tempcaseref, request.body.repid]
+    ]);
+    assert.deepStrictEqual(
+        JSON.parse(JSON.stringify(res.state.jsonBody)),
+        loaded.payload
+    );
+});
+
+test("admin representation completion accepts legitimate filename punctuation", async () => {
+    const loaded = loadAdminRepCompletion();
+    const request = adminRepCompletionRequest();
+    request.body.repid = "rep name_-_notes.v2 (final)!.json";
+    const res = createRes();
+
+    await loaded.mod.default(request, res);
+
+    assert.strictEqual(res.state.statusCode, 200);
+    assert.strictEqual(loaded.calls.queue.length, 1);
 });
 
 test("getbloblistproxy success returns proxied payload", async () => {
@@ -1543,6 +1866,38 @@ test("admin storage refresh uses dedicated POST proxy while ordinary callers rem
     assert.match(viewAllSource, /getRepsFromBlobProxy\(containerID\)/);
 });
 
+test("admin storage completion uses dedicated POST route while ordinary completion remains unchanged", () => {
+    const rootDir = path.resolve(__dirname, "..", "..");
+    const adminSource = fs.readFileSync(
+        path.join(rootDir, "components/admin/tabs/storage.js"),
+        "utf8"
+    );
+    const ordinarySource = fs.readFileSync(
+        path.join(
+            rootDir,
+            "components/case/representation/representationComplete.js"
+        ),
+        "utf8"
+    );
+
+    assert.match(
+        adminSource,
+        /fetch\(\s*"\/api\/admin\/createrepcompletemessage",\s*\{\s*method:\s*"POST"/
+    );
+    assert.match(adminSource, /container:\s*c\.container/);
+    assert.match(
+        adminSource,
+        /tempcaseref:\s*folder\.repJsonBlob\.name\.split\(\s*"\/"\s*\)\[0\]/
+    );
+    assert.match(
+        adminSource,
+        /repid:\s*folder\.repJsonBlob\.name\.split\(\s*"\/"\s*\)\[1\]/
+    );
+    assert.match(adminSource, /if \(!response\.ok\)/);
+    assert.doesNotMatch(adminSource, /sendRepCompleteMessage/);
+    assert.match(ordinarySource, /sendRepCompleteMessage\(/);
+});
+
 test("getawaitingsubmissionfromblobproxy dependency failure returns GET_AWAITING_SUBMISSION_PROXY_FAILED", async () => {
     const mod = loadModule(
         "pages/api/file/getawaitingsubmissionfromblobproxy.js",