Tabula rasa account key?

I bought the game, last one my wal-mart had, and there is no CD key in my game. Very very upsetting, can take it back but will get me nowhere since thats the only place in about 100 miles that would even carry such a product. So im wondering if anyone has a key that I could use, maybe your EXTRA key was the key that I am missing. Either that or a old key that you use to use but dont anymore... please someone help me.