I'll bite, I'll contribute my two-cents to the discussion as that's about all my opinions are worth. Provenance is a great thing to have, as folks are always curious to know the history of their gun; but my experience has been that, unless the previous owner was somewhat of an acclaimed celebrity like Annie Oakley, Teddy Roosevelt, etc. provenance doesn't generate much additional value. With your Trap Grades, if one were an example of a high-conditioned and very rare steel barreled 10-bore ejector, or the extremely rare .410 bore you'd have collectors beating down your door; but the 12, 16, and 20-bores seem to be judged by original condition (and by barrel length with 16's and 20's, as small bores with 32" seem to be hot items). A good way to approach selling a gun for premium value might be to feature the gun and the story of its provenance in a published article such as the LC Smith Journal, as making a gun "known" always generates interest; and interest usually equates to higher values.