The unknown author found the DOI as a "KEY" he said by accident. It worked on one of the cypher codes but not on the other two. He saw that he had more work to do. Since Robert Morriss supposedly told him about the letter to be sent in 1832, he, the author believed that someone may have that letter with the answer to his problem with the DOI working on C1 and C3.
Every person I know of that wants to find the fabulous Beale Treasure, the first thing they do is try to find different books to use as a "KEY' such as the family Bible or Shakespeare but in the end C1 is all they can work on. Not very many ever looks at C3 because no one cares who buried the treasure---all they want is the treasure.
The copy of the DOI in the Job Print Pamphlet that the author used was from an 1876 school history book.
Also C2 that was deciphered by the author using the 1876 DOI was also encoded by the same DOI of 1876 so I might ask how did Thomas J. Beale use an 1876 DOI to encrypt C1, C2 & C3 in 1819 and 1821, if the encryption came from an 1876 school history book? This means that the author made the C1, C2 & C3. He also made the letters of TJB and the entire story up. End of the road at least end of the search by yours truly. On to more rewarding searches.