Originally Posted by Counsellor

Not what they were, but they do count as a "product code" same as the code inside a cap

They can also be used for donations to charities and other worthy causes here: https://us.coca-cola.com/give/ The 12-pack flaps are a 15 cent donation (sometimes doubled, depending on the charity). By comparison, the cap lid codes are worth 5 cents. For the donation value of codes, see: https://us.coca-cola.com/give/code-value/