All joking aside this guy is lucky not to live here in the UK. A lot of sales done via Ebay are eventually completed face to face with cash payment. Most places are within easy reach in a few hours.
If he'd pulled that stunt over here and got caught out he'd get his lights punched out, if he was very unlucky he'd have sold the watch to a very well known Dealer based here in the Midlands who, shall we just say has some very heavy connections. The end result in that situation would be far more terrifying for the idiot
Moral of the Story is never try and pull a fast one, messing people around when they're buying very expensive watches is not a clever idea
DH