If you wanted to prove it's provenience and are will to pay for it, you can go to Smith & Wesson's site and fill out a form and send it in with a check and they will give you back a certified letter that is kinda like the revolvers birth certificate.
Firearm History Request
You can usually get that cost back when you sell it as you state that it comes with papers.
I have asked the question directly by emailing them in the past, but that was years ago and I'm not sure they have kept up that level of customer support. Worth a try. They told me month, year, and how many were ever made of that model/configuration.
Otherwise, go to
Smith & Wesson Forum Join and ask there. Lots of those guys have all the books and you will probably get two valid answers within days.