Are the boxes at a Post Office, safety deposit boxes for the Republic ?

[motla68]

Above is a couple pics of my journey to a post office yesterday.

Here is some additional information found about the Postal Savings System;
http://en.wikipedia.org/wiki/United_...Savings_System

Registered mail - " Earlier similar services were known as Money Letters. "
http://en.wikipedia.org/wiki/Registered_mail

Similar wording found " Letter of Marque " mentioned in the Constitution or " Letter of Credit " from the more well known popular banks.