Called the dealer from where I purchased my GTO and told him I never got a security card. He never heard of one.... He did some research.... they sold 4 GTO's and NONE had the security cards.
He called GM's dealer center and he was informed the cards should be in the plastic pouch the owners manual comes in. None of the cars they sold had that card.
He was able to get me the codes from a website dealers use. I was given the Ignition Key #, Frequency Key#, IMMO Code #, Radio Pin#, and Glovebox code#. That's all the numbers there are I was told.
Why my car did not have the security card is beyond me. If anyone else did not get one, I'd call your dealer, they can get the numbers, but not the card.