Well, its on the very reliable internet, so there is little to no chance that this is just a prank...
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I go on that site a lot and they find some incredible stuff. I have personally seen large caches of silver coins and silver rounds found here in Colorado. Some guys digging a water line trench in Alamosa found someone’s jar of Silver dollars. It was common practice to bury stashes of gold and silver coins in chicken coups and coal bins or under fence posts or large trees. There are metal detectorists who look for nothing else. I prefer to hunt for old coins dropped in yards and along parkway strips. The finds are more frequent, but finding a mason jar full of gold coins would be an awesome experience.
There are even guys who go out looking for meteorites. One was found by a couple with a metal detector in a dry wash near Salida, Colorado a few years back. It turned out to be a rare type and was worth several hundred thousand dollars.
Great hobby.