Use: on eBay open any sold view with "Sold items" ON, let results load, click the bookmarklet.
v5 shows a live progress overlay on the page, fetches pages 6-at-a-time in parallel (much faster),
reads up to 100 pages × 200 items, extracts MPNs (ZX10, HMCG84MEBRA115N, MZ-V8V1T0B…), and if it finds nothing it
reports debug link counts so we can see what eBay served.