My bid for a concertina on ebay was not the winner BUT after the auction I was approached by email with an offer to buy it at my bid price. Just to make certain, I emailed the original seller of the instument, who assured me that the concertina had indeed been sold.
This has all been reported to ebay, but PLEASE be aware that there are unscrupulous people out there, and if it looks too good to be true it usually is.
A very good friend recently had an almost identical experience...........Have you???