H and I were invited to an October wedding last June (yes the invitation was received in June). We knew we couldn't attend. I RSVPd immediately and shortly sent a card and a gift card. We have yet to receive a thank you note. I am concerned that they may not have received it. My daughter thinks I should wait for a while since they may have been waiting until after the wedding to write thank you notes. I was just going to contact the groom's mother (my friend) and ask if they received the gift card. What would you do?