We went to a wedding three months ago, forgot the card at home, and mailed it to the couple the very next day with a check. After a month went by I sent a quick message asking if they got our card in the mail because I was worried it had never arrived. I did not get a response, and then a few weeks later we got a card thanking us for our generous gift. The strange thing is, they still have not cashed our check. I am not sure if it never arrived or if they lost it, but now we are in an awkward position. Any thoughts on how the best way to handle this is?