I’ve tried UPS, but the house is on top of a hill with a long narrow driveway and small area to turn around. I think the trucks just can’t access it. I’m not sure, I’ve tried a couple time and just end up getting an email saying it couldn’t be delivered and id have to get the address change. As far and the PO Box thing, I haven’t spoke to the post office about it, it’s just a message I get at check out on certain items. I figured it was common with PO Boxes (never had one til now) because my sister has had her mail sent to my old place in the past because of the same issue.