It was only going across town. It was properly addressed and had a return address visible. The post office claims it was delivered to my house. I never got it. So I'm thinking either:
(a) It was stolen off my front porch (unlikely) or
(b) It was delivered to the wrong address and someone in that household just tossed it in the trash (also unlikely).
So where the hell do missing parcels go? I've never had this happen before.