I believe the USPS has been holding millions of dollars from dormant prefunded permit accounts, and at a specific point making it almost impossible to get the money back.
In the 20 years I have been helping customers save money on mail, few times have I seen entities with detailed reporting on all of their different spends.
As the only mail audit and recovery firm in the US and Canada, we manage a portfolio of over 174,000 pieces of mailing and shipping eqipment for the largest US companies.