I and others I know have run into similar issues with UPS. One driver couldn't be bothered to find an address, so the packages were dropped off at a random house at the very end of the route.

I've also come home, in several places I've lived, to find packages at my door. A couple of these places were apartments in not-the-best neighborhoods. I was lucky that most of it wasn't stolen.

In every case, the driver scribbled something in the signature block, and entered the surname of the person on the label, basically a case of CYA for laziness.

I cringe when I want to order something I can't find locally (or for a reasonable price), because I've had issues with all three major delivery options (UPS, Fedex, and USPS) somewhat consistently.