Shipping etc is all automated and if everything goes as planned, scans happen, truck swaps happen, it all goes well.
If, however, a box gets misscanned, the barcode gets damaged, etc, then a human has to look at it and make a decision. These humans were mostly replaced by technology so there are not many of them. It may be waiting for an employee to come to work after working at home for a week and look at your package and send it on it's way.
jerry