TCBoomer,
You need to find out the CT law. In NC, it is a misdemeanor to move/disturb a survey marker but that ain't CT. :laughing: Your surveyor should know if there is such a law in CT and what chapter it resides. It is one thing to know the law exists and another thing to prove the neighbor removed the pin. Your surveyor should know the law in CT.
I personally would not touch the survey marker including pounding it further in the ground or pouring concrete around said pin since that is disturbing the pin. Not that I think that is a criminal disturbance, but if the issue ever went to court, and I was asked if I had touched the pin, my goose is cooked. I would have to answer yes and then hope my explanation is believable. A believable explanation might still allow doubt. I don't touch property pins other than to tie flagging or paint them.
Me thinks the neighbor is absolutely trying to push your buttons and get under your skin. My advice is to realize that is his intention and not let him get to you.
Later,
Dan