All respect to the posters, the research/information and the theories in this thread.
Because well researched theories have (unfortunately and maybe wrongly) been negated by law enforcement or ignored by law enforcement, I'm trying to approach from a different perspective.
Being from rural Pennsylvania, living in rural Ohio, previously having lived in the Chicago area, later in life gaining more awareness of Indiana due to kids in college...
Here are my thoughts on the books, contact lenses, rifle, gun case, and possibly camping gear:
I put more emphasis on the contact lens being from Chicago as a location for Mr Bones birthplace, early life. Chicago or a radius of Chicago, Illinois.
That would include Indiana, Ohio.
I find local customs ways of doing business a possible clue.
Illinois, Indiana, Ohio, Kentucky all have frequent, big event Gun Shows.
Guns, Knives, Sportsman gear, Survival gear, are bought and traded.
In years long past there were very little or no records kept and cash purchases.
Add to the Gun Shows the local Farm/Barn sales found everywhere in the rural areas of these States where the rifle, case could have been found.
Any of the items could have been purchased by Mr. Bones in any of these States at one of these venues. No records.
So I do not think we can totally rely on the items manufacturer, retail point of sale, to tell us Mr Bones place of birth or his home prior to his trip to Pennsylvania.
Sorry to point this out since there has been so much good research done on these items. I am not discounting this prior research, I could be completely wrong. Just trying to look at it all from a different angle.
The books.
Mr Bones had 3 books that he carried with him that had to be important to him and his journey.
Unless, as has been theorized, the books were planted as a red herring and that is possible.
Two poetry books and one scholarly, heavily scientific, very difficult reading - "Science and the Modern World.
From Goodreads. Here is a synopsis. I can barely understand it.
"Alfred North Whitehead's SCIENCE AND THE MODERN WORLD, originally published in 1925, redefines the concept of modern science.
Presaging by more than half a century most of today's cutting-edge thought on the cultural ramifications of science and technology, Whitehead demands that readers understand and celebrate the contemporary, historical, and cultural context of scientific discovery. Taking readers through the history of modern science, Whitehead shows how cultural history has affected science over the ages in relation to such major intellectual themes as:
romanticism
relativity
quantum theory
religion
movements for social progress."
Please read some of the comments for further insight as to the contents.
VERY Deep thoughts for sure.
Science and the Modern World by Alfred North Whitehead
Finally, could the key could have been a Hotel Room Key. This would fit carrying one key during the daytime/camping adventure.
My theory is he would have been staying at the world famous Bedford Springs Inn.
Omni Bedford Springs Resort - Wikipedia
My personal belief is Mr. Bones was an unusual man, a wealthy, well educated, nature/health enthusiast who was seeking...something.
I have no solid conclusions after putting these thoughts out for consideration.
He could have just been a man out hiking, camping, enjoying the beauty of the area/nature, maybe hunting for Morel Mushrooms.