Lol, but you weren't looking for or expecting something as simple as a 'ha ha you solved our little thing' sign or tell or a 'look here' 19th century Masonic symbol.
Exactly where on Sharp Top mountain the masons split the boulder for the Washington Memorial (masons, get it? That's how obvious the clues are), I'll leave that to the guy who does wants to go that far into the archives. But if I was looking that would be the first location I'd check....
Just to express it so no one gets confused: there is no treasure on these mountains. It is just one example one of a number of (Masonic) tales that spoke of a treasure hidden on three mountains "in the form of a triangle". It's also just one of a number of similar locations where three such mountains appear and a lost treasure story became attached to them. Once you know what to look for the stories reveal themselves pretty quickly.
(In fact those of you following the KGC thing might have already come across some vaguely similar sounding parts as it's associated with this).
But next time you speak to some 'Beale expert' ask them to tell you the Treasure Mountain story and see if any lights come on, it's the one with the most obvious similarities. And if they haven't heard of the story explain it to them and see if the lights come on then.