I always love researching my bikes historys and make sure I have written provenance if the bikes are interesting.
My biggest scoop perhaps was tracing a Mk3 Moulton that I bought at a cyclejumble from a vicar who had been told that it was the personal property of the legendary Jack Lauterwasser, who was a 1928 Olympic medallist and built the Lauterweight racing bikes and is known for the Lauterwasser handlebars shape.
He worked for Alex Moulton from 1965 overseeing the S work bikes limited production line.
By phone, net and letters I was able to talk to all the previous owners, step by step, and eventually received an 8 page handwritten letter from the guy who bought the machine from Jack in 1985 with a photo of the bike as proof!
It may not be as easy in the states but I recommend the process, get it in writing before it is forgotten history!
I am still searching for a pic of Jack with the bike and I am sure I will find one !