When the Americans retreated before Burgoyne`s advance in 1777, they abandoned some forts with 400 cannon, but had previously hidden the powder in concealed underground bunkers far from the forts. Burgoyne`s inventories tell of the missing powder. One of his Tory spies told him of the powder buried elsewhere but only gave him a 2 mile radius of the location. These powder bunkers were apparently forgotten, do not appear in any records after that. They appear to be still there. They also hid uniforms and muskets in several caves; one cave was discovered by local boys in 1952 with muskets and decayed uniforms. One hidden musket with bayonet was discovered by my nephew 1/4 mile from one of the caves.
Burgoyne`s paymaster`s ship, loaded with 10,000 gold coins to pay the German rear guard echelons in Vermont and NY sailed late from Canada down Lake Champlain, failed to meet the rear guards because of American ambushes on the latter. The paymaster sunk the ship in a river near Whitehall, NY -
It was discovered by a civil engineer doing a land survey in 1902 who noticed that the river`s course had changed and exposed the riverbed with the ship. He recovered the treasure chest and snuck it into a bank vault in Vermont coz NY State would have claimed it. I do not know what happened to it after that.
At the Battle of Mill Springs, KY in January 1862, a number of Confederate soldiers were plagued by their antique flintlocks misfiring (it was a foggy, sleety day) so many of them hid their old guns under rock ledges so that they could claim they'd lost them and thus be issued newer weaponry.
When the battlefield was turned into a state park a few years ago, a team of researchers from the University of Kentucky went down to the battlefield and located dozens of these weapons. They were still in fairly good condition, considering they'd been there for over 140 years. Several of these flintlocks are on display at the battlefield's museum.