A gold seller could make a mistake and buy it. Since that item was already used in a transaction before, they could think it was overdue or something like that and buy it.
But anyways, thanks for clarification on this subject.
I found this item wich my Auctioneer says it was sold for 200g. This item was obviously used in a gold transaction.
My question is, if i put this up for sale in the AH for this price and someone buys it ( obvisouly a gold seller) will i get a ban?
http://imgur.com/a/EaI1L