Chick do't worry, I think we all have been there.
A while back me and another member were at a car show and spotted a 69 Z, we started making mental notes. When we got back to our cars, we compared what we saw. Long story short - we both picked up enough questionable items about the car we had to go back and look to confirm it had a new trim tag, and along with other hints it was most likely not a real Z.