I have had some deliveries that were never notified before, but always some sort of Delivered notification has been sent.
I think you have a bad driver that doesn't know how to make the system notify you. I have a bad driver that always seems to notify me of a package being delivered.... way before it gets here. Makes you think someone stole your stuff before you looked out the door until the jerk pulls up and you meet them at the sidewalk to take delivery...