It's a scam if he claims that those are exact pics of HIS pair of R10's. With R10's the wood grain is different for each pair and those pics have been posted before by someone who still owns that exact pair. As Ed mentioned, there is a small ding in the close up pic in the exact same location, just totally impossible that THESE PICS are of HIS pair of R10's.
But there is also no accounting for laziness. It's entirely possible that this guy actually owns a pair of R10's but for whatever reasons finds it too difficult to take pics of his pair. He's obviously stolen the ad copy. Why not steal the pics as well?
Yet, anyone selling these expensive headphones with an ounce of sense would realize that potential buyers would expect the pics shown (other than the stock photo) to be of the pair that they are buying. People spending this kind of money (on a pair of headphones of all things) should either have an opportunity to see what they are actually buying, or at least have a real sense of assurance that the seller actually onws the item in question.
So even if this guy, in the ultimate sense, is honest in terms of owning a pair of R10's and actually intends to send them to the winner, he's not very wise in terms of how he's going about the process.
I'd steer clear of it myself. It's got scam written all over it.