diff --git a/src/app/(app)/collection-confirm/page.tsx b/src/app/(app)/collection-confirm/page.tsx
index 92fd52b..69f4b54 100644
--- a/src/app/(app)/collection-confirm/page.tsx
+++ b/src/app/(app)/collection-confirm/page.tsx
@@ -22,6 +22,7 @@ import {
   buildConfirmPatch,
   buildReturnPatch,
   canConfirmRow,
+  formatNoteBody,
   groupRowsByPurchaseOrder,
   parseNotesFeed,
   readInvoiceDetails,
@@ -1412,7 +1413,7 @@ function ConfirmCard({
                   <span>·</span>
                   <span className="font-semibold uppercase tracking-wide">{categoryLabel(entry.category)}</span>
                 </div>
-                <p className="mt-1 text-foreground">{entry.body}</p>
+                <p className="mt-1 text-foreground">{formatNoteBody(entry.body)}</p>
               </li>
             ))}
           </ul>
diff --git a/src/app/(app)/collection-confirm/view-model.test.ts b/src/app/(app)/collection-confirm/view-model.test.ts
index a6bbffb..014afd4 100644
--- a/src/app/(app)/collection-confirm/view-model.test.ts
+++ b/src/app/(app)/collection-confirm/view-model.test.ts
@@ -410,6 +410,16 @@ describe("appendCostNote", () => {
     ]);
     expect(appendCostNote(existing, { id: "u-1", name: "sj" }, 10, 10)).toBe(existing);
   });
+
+  it("survives a parseNotesFeed round-trip with the prev/new object body intact", () => {
+    const stored = appendCostNote("", { id: "u-1", name: "sj" }, 45, 50);
+    const parsed = parseNotesFeed(stored, { id: "row-1", drv_collected_at: null });
+    expect(parsed).toHaveLength(1);
+    expect(parsed[0]).toMatchObject({
+      category: "cost",
+      body: { prevCost: 45, newCost: 50 },
+    });
+  });
 });
 
 describe("dedupeAttachments", () => {
@@ -443,4 +453,9 @@ describe("dedupeAttachments", () => {
     expect(dedupeAttachments([{ id: "a" }, { id: "b" }])).toEqual([]);
     expect(dedupeAttachments([])).toEqual([]);
   });
+
+  it("does not push the same item id twice when a row lists the same filename twice", () => {
+    const out = dedupeAttachments([{ id: "a", order_item_attachements: ["INV.pdf", "INV.pdf"] }]);
+    expect(out).toEqual([{ filename: "INV.pdf", itemIds: ["a"] }]);
+  });
 });
\ No newline at end of file
diff --git a/src/app/(app)/collection-confirm/view-model.ts b/src/app/(app)/collection-confirm/view-model.ts
index 72092a9..e2376fc 100644
--- a/src/app/(app)/collection-confirm/view-model.ts
+++ b/src/app/(app)/collection-confirm/view-model.ts
@@ -1,11 +1,13 @@
 export type NoteCategory = "collection" | "note" | "problem" | "quantity" | "confirm" | "cost";
 
+export type NoteBody = string | { prevCost?: number; newCost?: number; [k: string]: unknown };
+
 export type NoteEntry = {
   ts: string;
   actorId: string;
   actorName: string;
   category: NoteCategory;
-  body: string;
+  body: NoteBody;
 };
 
 export type ConfirmActor = {
@@ -63,11 +65,14 @@ const NOTE_CATEGORIES: NoteCategory[] = ["collection", "note", "problem", "quant
 function isNoteEntry(value: unknown): value is NoteEntry {
   if (!value || typeof value !== "object") return false;
   const candidate = value as Record<string, unknown>;
+  const bodyOk =
+    typeof candidate.body === "string" ||
+    (candidate.body !== null && typeof candidate.body === "object");
   return (
     typeof candidate.ts === "string" &&
     typeof candidate.actorId === "string" &&
     typeof candidate.actorName === "string" &&
-    typeof candidate.body === "string" &&
+    bodyOk &&
     typeof candidate.category === "string" &&
     NOTE_CATEGORIES.includes(candidate.category as NoteCategory)
   );
@@ -285,8 +290,10 @@ export function dedupeAttachments(
 ): DedupedAttachment[] {
   const byFilename = new Map<string, string[]>();
   for (const row of rows) {
-    const list = row.order_item_attachements ?? [];
-    for (const filename of list) {
+    const seen = new Set<string>();
+    for (const filename of row.order_item_attachements ?? []) {
+      if (seen.has(filename)) continue;
+      seen.add(filename);
       const bucket = byFilename.get(filename) ?? [];
       if (row.id) bucket.push(row.id);
       byFilename.set(filename, bucket);
@@ -294,3 +301,24 @@ export function dedupeAttachments(
   }
   return Array.from(byFilename.entries()).map(([filename, itemIds]) => ({ filename, itemIds }));
 }
+
+/**
+ * Render a `NoteBody` as a human-readable string. Most categories
+ * (`collection`, `note`, `problem`, `quantity`, `confirm`) carry a
+ * plain string body; `cost` carries `{ prevCost, newCost }`. The UI
+ * just needs a string it can drop into a `<p>` tag.
+ */
+export function formatNoteBody(body: NoteBody): string {
+  if (typeof body === "string") return body;
+  if (body && typeof body === "object") {
+    if ("prevCost" in body || "newCost" in body) {
+      const prev = (body as { prevCost?: number }).prevCost;
+      const next = (body as { newCost?: number }).newCost;
+      if (typeof prev === "number" && typeof next === "number") {
+        return `Cost changed: ${prev} → ${next}`;
+      }
+    }
+    return JSON.stringify(body);
+  }
+  return "";
+}