Image via Hot Wheels Collectors website

Has anyone had issues with sending in the correct cardbacks for the K-Day Datsun 510 mail-in? I was going through my cardbacks last night to get 20 together to mail off and found that none of them match the “accepted” case codes listed in the rules for the mail-in. Even the ones that I got AT K-Day. For those of you who have already received your cars, did you match up the cardback case codes to what they asked for? Or did you just send in 20 recent ones and were good to go? I don’t want to send off 20 card backs only to have them come back and say “Sorry, these are the wrong ones. No Datsun for you.”