We had quite a few gifts either get separated from their "friend" that may have had a card with it or just ones that came without a card at all. We also have quite a few guests who don't appear to have given us a gift, but they are ones that I would've expected it from. So I'm sure that these mystery gifts and those guests are probably connected, at least some of them.
Anyway, how do I handle sending thank you notes to the people who I may have received a gift from but I don't know? I don't want to thank them for their generous gift if they actually didn't give one...should I just thank them for attending and leave it?