I certainly opened a can of worms here. Several relpies and I still
don't know about USPS but much about Sovereign Immunity.
Two of LN in DC posts muddys the waters:

Product Placement on Stamps
LN in DC Aug 2, 11:01 pm
Whad'ya expect when the post office is "privatized"?

OT Sovereign Immunity
LN in DC Aug 2, 10:41 pm
The USPS is still an agency of the US government.

Agency of the US government and "privatized."
I suppose it means no one wants anything to do with the carrier of
mail.
Sounds like the FDIC and FSLIC have a bed buddy.

Ralphael, the OLD one