@zealous, oh. Well, that sucks. The post office might let you pick it up if the street name on the package is on your license too. My ex picked up a (fairly expensive) package for me from the post office, and they didn't even bat an eye, which surprised me because we didn't share the same name, and we may have had different addresses then too, but I can't remember. He had the tracking info and everything, though.
But they can't help you now? At least with UPS, even after its been shipped or even out for delivery, the shipper is the only one who can change the address. (That's how it was a couple years ago, so maybe it's changed?)