I actually don't know the answer to this, so perhaps you can help me.
Is the USPS completely funded by the fee's it imposes for shipping, purchasing boxes, etc? Or does it recieve any tax payer funds to pay for it's facilities, equipment, employees, and other operating expenses?
According to their financial statements they get about 2bn a year in 'capital funds' from the federal govt. And of course they dont pay federal taxes.