That's the point.
The way the Beale Papers is constructed, it slowly draws the reader in, paragraph by paragraph, so by the time one comes to the provided DOI "solved" C2, they never give the C2 a second look, but move on to solve the C1 & C3.
When one studies those involved with the creation, publication, advertising, and selling of the job pamphlet, and the various books, news articles, family histories, and so on that provided influences that can be found and traced to their original source, it is easy to determine that the story is a work of fiction, and the ciphers merely a parlor entertainment.
Now that is saying a lot. I have kindly leaned that way here lately. I have researched this Beale Treasure and worked on solving the C1 & C2 for the past 52 years. When I first read the deciphering of C2, I was kind of suspicious of it being a made up story.
First, the author said he arranged the cipher papers in the order of their length and numbered them, then starting with C1 he would procure books and number the words to see if each could be the "KEY" The author said he was unsuccessful until he numbered the DOI and it gave him the meaning of C2 by accident. In the deciphering of C2 he comes up with it saying, C3 has the names of all his associates and their place of residence, C1 gives the exact locality of the treasure vault. How did C2 contain reference to C3 & C1 if the author himself numbered the pages of codes?
Another error was made by the author in his haste to number the words of the DOI, he gets down to around number 460 and makes a fatal mistake by making a miscount of ten. He puts the same number down two times in a space of ten words then numbers them the same as usual. Yet when he deciphers C2 all of the letters above his mistake hit on the exact letter he was looking for in the decipherment when they should have been off by a count of ten.
A third mistake the author made was when he wrote down what C2 and he substituted "thousands" for "hundreds" and this clearly is not what the plain text said.
A fourth mistake the author made was using a DOI that published in 1870's instead of before 1822. As 1822 should have been when TJB wrote down C1, C2 and C3 yet the author's DOI came from the 1870's
Thomas Beale had the highest respect for Robert Morris to carry out his plan for he and his associates demise yet Robert Morris does not open the ironbox in 1832 he waits another thirteen years longer and this in itself could have cost the heirs of the associates their shares of the treasure. Robert Morris almost died at the age of 69 why did he not expound his secret to the author then instead of waiting another 16 years.
There is no record in the newspapers of St. Louis, Mo. or Franklin, Mo. some 200 miles further up the Missouri River about Thomas J. Beale's Party heading West or heading East the four trips he said he made.
The Spanish Archives are very accurate. They report every party by name and each member of the party and their names. Yet you search from 1817 to 1822 there never was a Thomas J. Beale or party in Sante Fe. They never traded and they were never arrested and they certainly did not buy any mining supplies as the Spanish would have accompanied them to the death. James Pursley only had a few nuggets in his shot pouch and the Spanish continually asked him to take them where he found the gold, Pursley refused and they kept him under house arrest from 1805 to 1822. Pursley was released and traveled back East with the Jacob Fowler Party.
This is my reasons for believing as ECS does that the Beale Treasure was a parlor story and made for profit. You can search and you can post how you broke C1 and C3 but believe you me if they could have been broken I would have broke them years ago. Happy Trails to you.