There is an office I have a number of friends working at, that I drive by at least three times a week. Drive by, as in, I drive RIGHT PAST the building.
At one time, there was a box of files in my car I either kept forgetting to drop off, or just plain didn't feel like stopping because I wanted to get home. This went on for almost a month before I finally remembered to stop
That said, my feelings would be hurt that she hadn't picked up the package yet. I hope she did say thank you, and let you know the package got there though!