This is my biggest pet peeve. So, if you haven't yet received a thank you for a wedding gift, I completely understand your frustration. Generally, a couple should send a thank-you note for wedding gifts within siz months of the wedding date (really three if you ask us). But that's not always the case. If you're worried whether or not they received it, you should be able to get confirmation it was delivered if you bought it online. If you want more of an acknowledgment than that, you can always text or email the couple and ask them if they received it. That should give them a hint. :)