» Fri May 27, 2011 4:07 pm
As has been said, it is on the inside of the case for the standard version, right below the CD. You really can't miss it. Since I don't have the collectors edition, I can't say. But, if the game CD came in a sleeve, you might want to check the back of the sleeve.
@SystemShock
Games on Steam still need keys, that is how you add a game to your Steam library. Once you have entered the key, you can then go to anyone's house, log into your Steam account and install the game without the need to ever have the CD again.