There were around 11 parties (around 20 people) who came to our wedding but did not leave a card or gift.Our card box looked similar to a gift and there were a few people who mentioned that they didn't know where the card box was, my brother included (I think everyone who asked about that has already mailed their gift though).I'm wondering if some guests may have left cards on the gift table that never made it to us (my sister's gift was missing and that's how we began looking at this issue). It was chaotic after the reception and many people helped move gifts from the reception to our suite upstairs. We're missing lanterns, candelabras, etc. and other decorations so I'm not 100% confident in the hotel staff.Should I follow-up with those who didn't leave a card and say that some gifts may be missing? It seems rude, but I also don't want to NOT thank someone who gave a gift.My plan right now is to just send a "thanks for attending" note. I'm sure this has happened to others- what did you do??