I had it happen to me with a pickup sale. A guy bought some pickups from me and 29 days after USPS delivered them, he messaged me saying they weren't working and that he just then hooked them up. Now they were working when I pulled them out of my tele to box them up. 29 days is a long time. Maybe they didn't work when they arrived at his house. Maybe he broke them when trying to solder them up. Maybe he played them for 28 days and decided he didn't like them and my policy on Reverb says no returns unless items are defective. I have no idea, but no way am I going to take a return nearly 30 days after they were delivered. Had I gotten a message in a day or 2, he could have sent them back and I would have given a refund.