For my bridal shower, one of my guests wanted to purchase an item off our registry, but since FI and I were OOT (visiting our hometown, which is where the shower took place) and thus there would be no one to receive the package if it were purchased and shipped at the time of the shower, I was given a certificate made by the guest that said "one place setting to be delivered upon the bride's arrival home".
We have now been home for a few weeks and I'm in the process of writing out thank you notes for the shower, but we have not yet received the gift from this guest. Fine- no big deal. BUT- do I not send a TY note until it is received? Send a note thanking the guest for the certificate of future gift?