It’s all paperwork from the 15 working day point, and appeasing the buyer.
I lost an expensive item in the past I once sent out (fork) and after I put in my claim they suddenly found it and delivered it. Must have got stuck in a dark corner of a warehouse or something. I was refunded the postage costs because I applied for them.
It can get a bit sticky here really. You’ve spent money selling the thing, then it disappears and reappears after you’ve paid back the buyer. You’ve wasted time and possibly money claiming for the lost item and then it’s back in your hands, not quite square one.