Wowzers!

[Peachy]

A little later, during the Civil War, Confederate raiders captured a Union convoy heading from West Virginia to the Philadelphia Mint. The convoy's cargo of 15 tons of silver bars was stolen and hidden inside a cave north of Uniontown, Pennsylvania. The rebels sealed the mouth of the cave and never returned for the booty. Some say it's still out there waiting to be discovered.
I've heard about this one since I was a child. This is my local "big one". You load 15 tons and what do you get....

 

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[Jason in Enid]

highly, highly, unlikely. Even if the capture and hiding DID happen, there is no way everyone later died before the war ended. Even a single survivor would have gone back for the silver.