I wasn't quite sure where to put this thread as it encompasses the sale and trade of all types of games.
Because rare games change owners so often, I was wondering if, as a general rule, you keep records of which games have gone to whom so it is possible to track them later? Say, if you wanted a game back, or another potential buyer was interested in where the copy ended up. I know some people make lists of current owners, but if records are not kept I'd imagine it's easy for these lists to get out of date, especially since multiple people have made and maintain them. So...
Do you keep records of BUY/SELL/TRADE gaming transactions (who it went to, at least)?