That is weird; maybe they enter you in a draw for the ps3/move contest? But they would have told you that you won it. Definitely curious as to what you will receive in the mail.
I emailed them about it, and their customer service people sent me links to my prizes.....just digital downloads, wallpapers and a video, which I figured but was never given those links once I registered everything. I think it was just set up badly for receiving your prize.