To the left is the image of a cypher, void of any specific author, with instructions on how to read a coded letter. It reads:
I am las Casas
The superscription and the signature be found in their proper place and [illegible] be read forwards in the usual way.
To read the body of the letter you must begin at the bottom and read backwards up. Capitalize smaller letters placed without any sense to propriety
V Signifies Bonaparte