A buyer number or account ID is the number linked to your account. Buyer numbers are in the format 'B1-1234567'. You can find your buyer number when logged in by going to Account -> Overview. The buyer number is listed there under Account ID. The buyer number is also displayed in the top left corner of your invoice.
An auction number is linked to an auction, and a lot number refers to a specific lot (product) in the auction. Auction numbers are in the format 'A1-12345'. Lot numbers are in the format 'A1-12345-67', where the number after the last dash indicates the lot. You can find lot numbers on the left side of the lot page under Lot or under 'Reference' on your invoice. You can enter an auction or lot number in the search bar on the site to view the respective auction or lot.
If you contact us, please have your buyer number, auction number, and lot number ready, if applicable.