Unfortunately people can troll ebay auctions by bidding on items and not paying for them, sellers are unable to leave negative feedback for buyers.
For the seller, I'd hope the buyer follows through but I'll be keeping an eye out to see if this is relisted.
My fear would be the buyer redeeming the private key and refunding through PayPal.
That's also a very valid concern. Selling a slabbed coin could possibly help in that case.
Unfortunately many slabs are easy to tamper to get out and back in.
I think the value in these coins are the "error" in the manufacturing process. If it is validated as being one of the first Casascius coins, it would
still fetch a high price, no matter if the bitcoins are spend or not. I would be the paranoid person that would constantly check the balance, if I
bought the coin back then. Still some good money to be made, if you know what you buying.
