I sent a fairly pricy light to a buyer, and USPS attempted to deliver Saturday (it's now Tuesday night). So far it's just sitting at the PO apparently, which is rather annoying. I want to know it got there, it works and the deal is closed. But so far no reply from the buyer either via email or PM! I'm not going to be happy if it bounces back, and I'm not going to want to refund his money if it does. I for sure am not going to eat shipping costs to re-send it. Advice?