User blog comment:Pippinitis/Viewing expired auction links from Japan/@comment-31714002-20200919023120

This problem also seems to be extending to eBay. They used to leave up links to closed auctions, but lately they've been taking them down after a period of time. If you want to create a permanent link to an auction of a rare item as a reference source, use the Save Page Now feature at the Internet Archive and then link to the archived URL that is created.