it's a mystery.
Just kidding. If your local store has Mystery cars, go there and slightly peel the blister off so you can get a look inside. You will know if you have that car or not. If you have that car, just leave it for an employee to tape back up. If you do not or it looks new, take it out of the blister when nobody's looking and insert it into your pocket. I see empty Mystery blisters at my store all the time.