This how I feel about used guns and their value, including your Elsie and Fox SW. When this board perked my interest some six years ago in the doubles of my youth, I was most interested in owning only used guns, preferably the so-called American classics. Members were of great assistance to me.
As a gunner, I was concerned with condition, original or restored. I am no longer in the market because I have what I want. But I wouldn't pay a premium for a 100 per cent restored gun when there are lots of good originals around for $800. I believe Roy Eckrose's auction reports confirm this view.
Looking back, I probably paid more than some of the guns were worth. They were a good buy for me, however, because the guns I sought were going with me to the blind. This does not answer your question about the Elsie and Fox. It's only an indication of one gunner's feelings about those great guns. I have both.