One of the book that I sold recently (a double cover Avengers 294) was dropped off at the post office, and, as with other packages once they're secure at the post office, was forgotten about. A few days later I got a message from the buyer asking when I would be shipping it. I checked the tracking, and sure enough, there was no record of it having been received (even though I handed it to a post office employee at the window. Eventually it did get to the buyer, and then all of the tracking info popped up, but for a few days I thought it had been discarded somewhere. Granted that it was only about 5 days, not 2 weeks, but maybe give it a little time.