To this:
"He is now convinced that original guns are bringing the top dollar."
I would add "..high condition, all original guns..." This has always has been true and it always will be. The more original condition a gun has, the more valuable it is.
And the problem you run into with "restoring" stuff is getting it right.
On that Boss, finding someone who can do a proper job of reblueing the bbls is not easy. A lot of guys can reblue them, few can do it like it was done in London before WW2.
Same is true with reblacking the other stuff.
Reblacking a triggerguard so it looks like Boss work from the '20s or '30s is not easy, and there are very few people who know how to do it right.
On top of this, the guys who do know to do it right will charge you a lot for their efforts.
And if you do it wrong, all you have is another crappy looking gun.
OWD