Well I did receive the board and it works very nicely. The seller is waiting patiently for his missing bitcoins. Not very scam like.
Sam
I'd point the seller to this thread and ask them to contact MtGox support. However, my guess is that the seller is just watching a Blockchain site and is not actually logging in to MtGox to check. (if they use a Yubikey, this is quite possible, since logging in is a bit more of a hassle)