We are having a debate, and hopefully you girls can help! We are getting married in a month, and FIL's friends gave them a gift to give to us (they are coming to the wedding but didn't want to bring it along). We of course opened it right away

...but I didn't know if we should sort of pretend like we didn't and send a thank you note after the wedding, or just go ahead and send one now (I'd rather just send it out now). Any advice? TIA!