
Yes I have.
You should attack it for what it is, a Victorian era puzzle. Somewhat popular at the time. Everything you need to solve it is given in the text as it is written.
Well, I see no one has come up with the link between Thomas J, his surveying activities and a name in the Beale Cipher story. Find that and you'll get to the next part in the puzzle, well, the next clue anyway.
But of course you were all tipped off by the fact the story was just such an obvious copy of another circulating at the time it alerted you to just being a parlour puzzle.
The one whose waybill went:
We have deposited a large quantity of gold, calculated to be 27 to 33 million dollars in gold bars and gold dust. The bars are packed in boxes made of pine (Colorado-red) and cedar. The bars are 2 feet long, 2 inches wide and ½ inch thick. The gold dust will be found in double leather hide sacks. Each sack measures two feet long, a foot and a half wide. They are deposited in a rock chamber surrounded by rocks in a secure manner for protection from destruction. These deposits are different in each site. It is estimated that 27 to 33 million dollars were deposited, estimated by weight and size of each package. In each chamber we have deposited a bottle, inside of each will be found a manuscript containing the maps showing the location where we buried this treasure.
So, as they would have done in the 19th century you get both the stories, compare them and see what has been added to the Beale one. The added/changed parts are the clues to solve the puzzle.
It's a case of not seeing the elephant in front of you because you were told to look for the cow. In this case not even bothering with the elephant tracks of the rather blatant clue about Thomas J who surveyed the area where the thing is supposed to be hidden. American history about Thomas J does not seem to be a forte for many.
If you want to solve it do it the right way and do the work, you are even told,
"Nor is it necessary to devote the time that I did to this matter, as accident alone, without the promised key, will ever develop the mystery".
In other words stop looking for the non existent books because you don't need them. The elephant is in front of you.
He who can, come back and talk to me.