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Your only recourse is not your deposit back but also you most likely will be able to force the seller of the vehicle to sell you the vehicle. You paid your deposit and made arrangments with the seller to inspect/pickup the vehicle. A buyer of a good has an absolute right/duty to inspect a good before he accepts the good. The seller can not unilateraly resind the contract because you did not meet an unconscionable, modified term."
This is the last place I would ever like to argue with a fellow enthusiast (if you are one, and not just a lawyer soliciting clients), but if you are not familiar with ebay, the long standing practice has been inspect before you bid just like Barrett Jackson and Mecum. Its an aution, and the high bidder pays according to pre arranged terms. It is not a bid to look and say "never mind, I do not want it". If the vehicle is misrepresented or the printed description is not accurate then you have a case. As far as the buyer not collecting the car and paying in full within 72 hours, the seller (according to Ebay) can relist the vehicle and strike you as a non paying bidder. You may have a chance at getting your deposit back if "non-refundable" isnt stated. All communications must be in writing through Ebay.
I've had my goose cooked here before. Good Luck!
Chris