Just because you're still new, and I'm in a charitable mood today, I'll explain something for you.
If your center uses the PAS/EDD system, every package loaded in the AM is scanned before it makes it to the trucks. Those scans are compared the next morning to the delivery scans. When discrepancies show up, and a missing delivery scan is a discrepancy, a report is generated. Management does not like reports, and they will try to find the cause of the discrepancy that caused the report.
One day, probably when you are on break or off taking a leak, a supervisor will place a known mislead on this driver's truck. Another supervisor will be around when he comes in to do an audit on his pickups and send-agains.
Guess what will be found.