I would think a refund would be obvious but the authentication fee would probably be on you. I do not have any knowledge on the subject, but it was an option of yours to have it authenticated. Once its yours, any financial choices you make would be on you. Unfortunate though, sorry about your luck. If he had multiple auto's available that were all fake, then I think you may have options... but if its just one auto that maybe he was sold, then I'd think you'd be out of luck.