There is no recourse via ebay. You can complain but nothing can be done.
He was very clever in getting your son to pay cash as he probably knew if it was via paypal you can raise an Item Not As Described dispute and 99% of the time the buyer wins (much to my annoyance).
No such thing as far as I know. It might be because you don't pay a subscription here hence no membership numbers needed.
Send them a link to this thread that proves your a member?
So oh wise ****ing one, how much should it self for?
If the dealer is willing to offer me 17.5k for it then how much should I get for it privately? because I thought 19k was a fair deal.
No need to swear