So I sell action figures on Amazon, and last night someone bought one. I boxed it up, took it to the post office this morning and sent it out. Not two minutes after leaving the post office, I get an e-mail from the buyer "My son bought this by mistake I do not want it please cancel". So what the hell should I do at this point? Obviously the civil thing to do is cancel the sale, but I've already shipped it out. Should I advise the buyer to file a refund request and send the item back once they receive it? Would the fact that I have this in writing from the buyer protect me in Amazons eyes if the buyer tries to pull any sort of chicanery? Should I just tell the buyer to go pound sand? Never had this happen before, so I don't know what to do...