My package has been found and is now in my possession. The carrier put it in the wrong slot the other day when she returned to the post office, so it almost went back to the sender, which would've been a huge problem.
I got a very profuse apology from the postmaster. And apparently the carrier is mafraid to come to my apartment complex now for fear of running into me.
The guy at the counter was much more apologetic and friendly yesterday when I crossed paths with him again to.
It only took two days, but all's well that ends well.