Having been here from fairly early on....
I believe he lived in the Bear Mtn area or somewhere close. Camping in Harriman makes sense. ( it is legal)
The idea that he worked in NYC makes sense. Obviously there are a lot of tech jobs there. Busses from Bear Mtn go right to the city.
I thought then and still think now that an opportunity was missed by LE NOT checking Unionville NY for a camping permit. We know he camped there, I had the names of two people he camped with.
I hope one day he has his name back. Someone, somewhere, has kissed his cheek, held his hand, given him a hug, or just shared a smile with him. He mattered to someone.