I bidded on your auction, but then I've noticed that if you click on "view larger" of the picture, we can clearly see what the codes are. So someone probably did already use your codes without bidding. On your next Enjoy the ride code auction, you should simply take a Huggies picture, just like most people do. Don't take a picture of the code or someone will always use it without bidding.
I think the only way to refund the credits is if the buyers ask for it at the end of the auction. Or you can simply give valid, never used codes to the winner of the auction.
well I will leave that one up to you. I only have to buy pull ups once every week or two so it might take a bit before I get 2 more. So if you want to wait. I will send them when I get them or you could request a refund. Sorry for the trouble I didnt realize you could see the codes when I listed.