I'm new to this Benjaman Kyle thread as a fresh pair of eyes and mind. I find his case to be mysterious and intriguing.
I was thinking about Mr. Kyle's memory regarding living in Indianapolis.
In another thread, it was mentioned the connection between his chosen first name Benjaman and Benjamin Harrison, who was the 23rd President of the United States from Indiana. We know that both the Benjamin Harrison house and Fort Benjamin Harrison are in Indianapolis.
It could be possible that Mr. Kyle had a family member who worked as a civilian employee at Fort Benjamin Harrison, or he could have a family member who was in the military and stationed there. It's also possible that he could have lived near Fort Benjamin Harrison.
Has Mr. Kyle ever mentioned or recalled any telephone numbers?
Here's what I'm thinking. It's possible that he someday could remember an old telephone number years ago of a close relative by heart. That relative could be deceased and the old telephone number is put out of service by the telephone company for a number of years before it is reactivated again.
Now since he said that he had lived in Indianapolis and Denver before, there is a way to find old telephone numbers. I believe the reference departments of the main public libraries in Indianapolis and possibly Denver would have what is called the Criss-Cross Directory.
The Criss-Cross Directory is a very big book directory which lists the full names of folks living in those areas and possibly their occupations. You can do a cross reference by address number and street name. You can also do a cross reference by telephone number, where it would list all the exchanges of a phone number prefix.
Here is a link to Criss-Cross Directory company that will give you an idea what I'm talking about.
http://www.haines.com/ccdir1.htm
It is my understanding that the Criss-Cross Directory has been in published since 1932 in certain metropolitan areas across the United States.
So it's possible that the Indianapolis and Denver main libraries could have the Criss-Cross Directories from years ago in their reference or genealogy departments. It's also possible that they could have old telephone books from years ago as well.