I wouldn't have thought that putting the Jeep in an auction would achieve significantly more than you originally offered for it. If the owner has decided to put it in an auction then I would try and buy it from that auction, if I really wanted it. If the owner ended up being out of pocket, which could happen, due to seller's premium etc and no-one else wanting it, it will be their hard luck. If you can't get to the auction then you could probably be able to phone/internet bid.