Have you three been in touch with Andy's other two Droid R2 winners, to assure that they're in the same boat (which I'm sure they are)? Considering Andy's sterling feedback to date, I'm sure if someone commented to him on the fact that he is risking adding FIVE negatives to his perfect feedback, it'd probably whip him into shape right quick!
A seller who's been careful enough over the years to attain such a spotless record would doubtfully want that tarnished in such a major way.
And if Scott's already paid the guy, then you should seriously demand a refund immediately until he has the product back in stock (and mint). You should also just flat out ask him if he's hoping to replace those pieces when the other 1,504 show up, and if that's the case, ask why he hasn't informed you of such. This goes beyond the bounds of normal selling issues.
Actually, come to think of it, how long do you have to post feedback for an auction on eBay? Is it down to just one month now, or is it longer? If it's only a month, then he'll likely just wait it out with various delays, and then ream you later with nothing once you've no longer got any means of retribution on his dumb ass.
Hell, even if he does eventually come through down the road, the excessive delay and total lack of correspondence warrants a negative. I'd drop him a negative now, and cut all ties with the loser, as he's obviously shown that he's got very little selling integrity. He's risking 5 negatives just so he can hopefully make another $300 - $400 with those figures later on down the road. What a tool.
I'm sure it's safe to assume that you've been monitoring his auctions to make sure he doesn't repost any of those R2's, right? 'Cause if he did, that'd undoubtedly be the final nail in the coffin. The fact that he wouldn't even sell you the damaged R2's, and wouldn't supply a picture of all of them either, is proof enough that he's up to no good.