Anyone have good luck with the USPS finding their lost auto parts in the system?

I own a business as we ship thousands of packages a month. The post office is the worst of any carrier, and it is not even close. The post office is run and staffed by unionized Federal Employees, they are, for all intents and purposes, permanent employees and no one can get fired. Dealing with these people on a daily basis I actually marvel that they deliver anything on time or in one piece...