I don't think removing the auction within a reasonable time before it ends is a big deal, but if the auction ends and the seller refuses to sell at a low price, I might have an issue...
I had a situation that was similar when my item became "lost", or more accurately, I had sold it previously and forgot to remove it from my spreadsheet.. I then sold it again and was embarrassed when I to explain to the buyer that I really didn't have the plane.. Egg on the face in that deal, but it won't happen again...
