I didn't find any treasures, but I came close a couple of times. One table thorougly confused me with a flintlock SxS with recessed breech, next to a pair of Stephen Grant sidelevers, next to a pair of James Woodward bests. So I went home to ponder. I lost their card on the way home which is credited to divine guidance.
Also crossed a dealer off my list of "to be trusteds" after examining an English Best offered at full price. The gun was a composite with barrel and probably trigger guard from one gun, actions or parts thereof from another gun and an unrepaired crack in the stock offered with the oft quoted "I never noticed that before".