Let's step back for a minute, consider what we're really saying about the story with these CSA summaries. The whole premise of the mystery is based on events that we're told took place during the period 1817 - 1822, the details of which are provided to use in a story that wasn't published until 1885, the period of it's writing unknown but certainly sometime after 1861. Going back to the details in the story, the presented details in the story provided to us, once we change the basic foundation of the story and the period in which it occurred then the entire story itself becomes fiction and there is no real mystery to be solved other then what we have fabricated in our own minds. Hence, the letters can not be real, the iron box and it's contents cannot be real, there was no party in the west, the ciphers cannot be real, and there were no deposits. In essence, everything becomes a complete fabrication. The only hope that any portion of the story is true resides in the discovering of the evidence that supports the actual possibilities of the details offered in the original story. All of these other summaries simply serve to prove that the original story, or any portion of it, isn't true.