Here is a story my father in law tells:
My father in law's father and his friends would get together once a year to make corn liquor. Once the distillation was complete, his father would place his share of the liquor into a ceramic five gallon carboy, seal it with wax and bury it on his property. He would then dig up the carboy buried the year before and that is what he would drink on all year.
They lived in the area that would eventually become Patoka Lake. Patoka is a man made lake that was created by damming the Patoka River. When the core of engineers built the lake, there were a few towns that had to be moved as they were in the area set to be flooded. his father's home was one of these.
When the time came to move, it was right out the time that his father and friends would gather to make their corn liquor. His dad sealed up that year's carboy and prepared to bury it at their new home which was located out of the area set to be flooded, but when he went to look for the carboy that he had buried the year before he could never find it. He looked and looked, probing the ground with a long metal rod, but he couldn't find the previous year's liquor. Eventually the time ran out and they had to move.
I don't know if you count this as treasure, but somewhere under Patoka Lake there might be five gallons of some really well aged corn liquor.