That is a bit of a stinker. Years ago I ran into a similar situation where the seller sent me a handmade marble from another auction, not the one I bought. The marbles looked similar, but I bid a premium for the one I wanted and got sent the one I'd seen, but passed on (in order to bid more for the one I wanted).. Same deal with the other buyer that lucked out with "my" marble not very interested in getting it resolved