Wait to see if you actually get it back. Between USPS and weather problems. Who knows.
If you get it back, verify with the buyer regarding address. If it was correct, I believe the PO will redeliver it. If it’s the wrong address, refund minus shipping and fees. If the buyer wants it, they will need to buy it again with the correct address.
Everyone has options. Just be sure the best option is right for you.