Sold a couple of gift cards to cardpool.com. Got a phone call a few days letter asking where I had gotten the cards. Explained that I had won them and could provide documentation. They said that everything was fine. Then a week later I get an abrupt email that they were cancelling the transaction and were sending the cards back and that they were not going to disclose why. Made me feel like a criminal. I was honest and forthcoming and said that I could email them the letter that came with the cards and direct them to the website listing my name as the winner of the cards.