Same thing here, I opened my case up and there was no cd code, check the forums over at 2Ksports and people are screaming about this. I took my game back to Gamestop, told him the issue, he called the other 4 Gamestops in our county, and guess what, they checked the boxes and they are all missing cd keys. Its funny some of the people on the 2Ksports forums
were able to install the game, and complaining of bugs. I take it they did not get there copies from Gamestop. This stinks, way to let your your fanbase EA, oops mean 2K.