the best thing to do with a high dollar card is grade it... no condition issues. but even then the buyer can force a return.
after the fact, i mean now. i would state over the messages to him each and every tiny little flaw, and elude to the fact that you would have no problem canceling the sale. but remain calm with the buyer and don't be too short. (act like the cute girl at the GAP register)
the fact that we exist, in a universe of sheer randomness, is scientific proof that there are aliens.
we are the aliens.
i can say that with 100% accuracy.