It could be that thechipvault.com is pointing to the admin site (it seems to go to a setup version of the auction site) which your login is already cached (so you don't get the prompts to login everyone else does). My best guess.
The seller, the charity and the re-shipper all would be better served if they just sold the chips on this site. But I think he has made it clear. It will be his way or the highway. I suppose it’s no different than us sharing links with eBay auctions, etc.