Neighbor Thinks He Owns Past His Surveyed Boundaries

My question involves property in NY. I am currently having a neighbor saying he owns past his surveyed boundaries. We both used the same surveyor and our lines match up. But this one neighbor thinks he owns past the boudaries. He came on our property removed out no trespassing sign and stole a trail cam. What is the best way to deal with a neighbor like this.

I have links to both our surveys.

Neighbor Thinks He Owns Past His Surveyed Boundaries