For anyone that ordered there CE from Amazon.com, If you log into your account and go to your orders you will find a spot that says go to my game library. If you click on that it will bring up any DD game you have bought from them. and you can pull up your Product number from that page. I'm not sure if that's the code you need but it could be worth a shot.

I would test it, but the computer version was a gift for my brother. I know the PS3 is having issues with there codes though.