I have heard tales of gold stashed in trees. One was of gold in a 100 foot plus pine in a state park. Well, couldn't go chopping on that tree, so forgot about it until the park burnt up. Went and metal detected the downed tree- nada.
I was asked to remove a tree in a city park, old tree with a natural hole in the middle. Checked it real close as I cut it up into firewood, just lots of trash. Around a homestead I definitely am checking it out, public place I don't think I would stash anything there. Unless of course what is now public used to be a mining camp ect....