"However, an auction house with the reputation and resources of Julia's should be expected to do some of that for you as compared to Joe's Pawn and Barber Shop in Podunk."
When reputable big auction houses or for that matter, any auction house takes in guns that are rare or very limited, it is up to them to research as best they can before they list it.
A prime example, a few years ago this same auction house had quite a few Parkers listed as, I believe, near mint condition. Gave a good description and naturally serial numbers in their online catalog. Doug Turnbull stepped forward and said that those guns listed he had refurbished.
Now if he had not stepped forward in the beginning and those guns were sold, and later found out that they were refurbished, they would make good and refund the money, but their reputation I think would be flawed.
It just goes to show you that even this big auction house's experts didn't know.