Attorney word confusion..."endorse for lawful money", "cash the check" ...instead... we redeem for lawful money ("Casino exit strategy"), we present draft drawn on the bank rather than "cashing". Cashing a check is what you do when you present a draft to a bank that is drawn on a different back and want cash.
U.S. notes might be in book entry form nowadays.
It might also be worth considering the notion of the gold in the general market as being leased into the market by the U.S.
There was a guy who posted on one of the older sites who suggested the FRB to be a system for working black magic.