Things You'll Need
Instructions
Print out the available Hot Wheels Mystery Car package list to bring to the store with you.
Locate the package number. Turn the package upside down (with the car facing away from you) and look for a small combination of letters and numbers (for example: M6943). There will be only one package number on the back, so just scan up and down. Generally the code is near the large phrase "Mystery Cars" on the back.
Match the number to the list you printed with you.