>>4807775 (pb)
There is speculation these were/are part of the Smiley Face Killings, by MO, and the Police seem rule a lot of them as “suicides.”
The city of Boston’s vanishing men, outline on this blog (among many), the author provides an interactive Link to a map.
https://cryptidantiquarian.wordpress.com/2016/02/20/bostons-mysterious-vanishing-men/
https://www.google.com/maps/d/viewer?mid=1wrmfzHTMN25TnVqJkTHX00szpSM&ll=41.98530699881973%2C-70.89264754999999&z=10