Well I hunt with one partner and generally this is not something I worry about...
But there was a time when I was in Spain when I literally walked onto a Napoleonic battle site,
and started digging buttons and musket balls right away..
Since it was a long way from home, I talk to 2 of my friends that I hunted with at the time and took them there...
We found a bunch of stuff, then I found out that one of the guys started taking all his "friends"
there also, and within 2 years 40 people knew of the site...
When I went back after 2 years you could not hardly find scrap...
and we had taken unexploded cannon balls from this place.. (one of my friends said 40-50)
There were several nice buckles that came out of this place, tons of buttons, rifle parts.
I did not get much.
It made me angry so many people knew of my place and this is where they would all go.....
until after 5 years no one went because there was nothing being found...
Now I am very careful about real good spots I find and hold them only for me and my partner...