USPS DRIVER NEVER BRINGS PACKAGES

so I work for a guy who has a home office in his basement, we have a mailbox that is about twice the width of a standard mailbox up at the street and a LARGE (like 4'x2'x2') box outside the gate that we bought specifically to handle larger packages (which cost several hundred dollars) since we where informed USPS will NOT come through gates to deliver packages. We have had this setup for several years, we have informed the USPS personnel at the post office on several occasions and yet EVERY TIME we have a package that is shipped to us via USPS we get the tracking claiming there was an attempted delivery at like 7-7:30 AM (driver doesn't reach this point in their route till after lunch), basically the worthless employee running our route just never puts our packages in her car, we are a business, we pay for Amazon Prime specifically for the shipping options to get things here quickly, we cannot keep taking time out of our day (owner bills at like $95 an hour for his time and $55 for my time) to go get packages (30-40 minute round trip plus time waiting in line) because the worthless USPS employee refuses to do her damn job. What can be done to force this driver to do their job?