They are suggesting to track the number down from the TD and finding out who this guy is. I'm sure he has tried to sell others as well.
Um, what makes you think the dealer will:
A/ Give two hoots what the seller does his watch
and
B/ Would give up the guy's details?
Dealers are in business to sell watches not be a moral compass for the world.
Equally what makes you think it's someone here? 10s of 1000s of people not on the forums buy watches from our dealers. Even if we could "teach this guy a lesson" it wouldn't change anything and at any rate we should concern ourselves with what happens here, we ain't the International Scam Police. By all means report it to eBay, send an email to AP (who will be a lot more likely to act than eBay and when they complain eBay listens) but that's about all that can/should be done.