This is a guess, and only a guess.

Without the original stock and buttplate,it's value as a collectors piece is significantly diminished, no matter how rare. So the current fair market value (not what you paid)for a Elsie this rare is down and it likely won't appreciate any faster than the average market for LC Smiths. I like treblig's suggestion of making a second effort to locate the original stock and buttplate.

Failing finding the original wood, I would sell the gun now and get the profit out of it. I'd then get a shooter I wanted or a collectable that stands a better chance of appreciating faster than the general market.

The world cries out for such: he is needed & needed badly- the man who can carry a message to Garcia