Trdking, You are pretty much on the money with your post. There were a few who passed the nickles, but it was short lived once the word got out.
Ace, Check for signs of animal pins, if someone entered the yard the animals would sound the alarm and it was a favorite spot to hide your bank. Fence post was another place to hide your money, sometimes a hole was drilled into the post or burred under them. Ie: Post Hole Bank. If the house is still standing and you can figure out where the bedroom was check the area out from the master bedroom. If a man was awaking in the night he could see if his bank was safe. If it was a plantation, check the yard area front and back, it was the custom for the ladies of the house to through dimes from the balcony to the slaves on Sunday and watch them fight for them.
I good news: Today 9/18/17, I read an articular that stated the Trump administration is trying to role back the land grabs of the Democrap administrations and restore our uses of our land to us. There may be a future for Treasure Hunters yet.