The show mentioned that they got all of the families who received the calls together and went through their entire lives to try to find any kind of connection. Stuff like shopping at the same store, using the same repair company, etc. The officer said they couldn’t find any connection.
I wondered how much information may have been available and accessible through the schools back then. I when I remember when I was in elementary school we had a “Buzz Book” published every year that listed every family name, children’s grade and teacher, parents names, phone numbers, and jobs. Probably not it