The little punks have them *everywhere* here.
Property lines mean nothing.
Right now they’re planting stuff on ground they don’t know belongs to a very serious, scary branch of the gubmint.
Eventually they’ll run into one of the “Black BDUs” who patrol that mountain.
[they haven’t seen the ‘use of deadly force authorized’ signs, yet]
Not sure where you are, but I believe geocaching started in CA. When people make them too accessible, they get stolen or vandalized (one near my house was filled with urine; it was not 100 feet from a major road, and probably drew too much attention).