I know some people *do* mail out replacements; you are certainly welcome to. It's just an unmanageable task for me to keep track of who didn't send cards. I always do the max each round so I'm getting 40-50 cards each time, sometimes there's overlap between rounds, and people don't always label which round their cards are for. I figure it's best for me if I don't freak out about any missing cards. Or even to acknowledge that any are missing