Good question. I'm not really sure. Does a picture you post on a forum have any copy right protection if you don't specifically say so?
If it bothers you that much, you could create an account on ---- and bid 100,000 dollars and ruin his auction and send him an email stating why you did it or just send him an email and tell him if he does not remove it that you are going to do that. There are two days left.
The rolex forum I belong to does that all the time for watches that we know are fakes. We have accounts that we will go and bid a million dollars on them and force them to close the auction. We know they won't complain because they are trying to pass fakes. They keep opening up new auctions and we just keep ruining them. This is a little different though in that this seller is not trying to pass off something fake.
Your call dude.