The entire treasure story is based on this "unknown author" hearsay account of what Robert Morriss told and shown him while Morriss was under the care of his niece, Anzoletta Saunders during the "2nd year of the Confederate War".
Then, for 20 years tries to solve the three ciphers, but only succeeded with C2, so he writes a manuscript and brings it to Ward, for Ward can act as agent and publisher...
...and then Ward applies for copyright with only the title, accepting that the story presented is true while NEVER seeing the evidence, ie the letters, iron box, handwritten ciphers that the Beale story is based, and has his cousin , John William Sherman print the pamphlet copies, write book review copy and adds for the newspaper at which he was sub-editor.
During the period of publishing and sale this "unknown author" who started this just disappears from the scene.
The obvious conclusion being that:
1. There never was an "unknown author"
2. The "manuscript" was not completed when Ward applied for copyright as "agent".
3. There never was a Beale, or letters, or iron box with ciphers outside of the narrative text.
4. The "unknown authors" most probably were Ward and Sherman, with other relatives contributing input.