Bad Service on christmas? Youuu betcha!

I was all excited when I got my Sims 2 with the Open for business expansion pack.  Like a good little sims player, i know I need the security code for the installation. I odnt see it on the back of the package, and I dont see an owners manual inside. So i figure they did something different for security this time around.
WRONG!
Apparently the code is on the back of the manual which I never got with the game.
Electronics are hard to take back once they have been opened so I am nervous that my mom just spent 40 dollars on a box of useless discs.
:(

Im afraid to open any of my other gifts and play with them incase something happened with them as well.
ETA:
Nevermind. It was stuffed between the cushions on the couch. I guess I was a little more excited that I thought when I opened it. But thanks for the suggestions!