1.  You held an auction, not a sale, and should have followed thru with the sale at the final auction price.  Auctions are a contract between the host of the auction and the bidders.  The bidders are agreeing to honour their bids should they win.  The sellers are agreeing to honour the terms they set forth at the start of the auction.

2.  Your gold bar is fake.  You know it, I know it, dazedfool sure as fuck figured it out, and most importantly the Pamp Suisse scan proves it.