You may be talking about this.
Section 270:26-a
270:26-a Interference with a Vessel. – No person shall, without the consent of the owner of the vessel, wilfully and maliciously cut away or let loose any vessel which is fastened to any mooring place or lying at anchor. Whoever violates the provisions of this section shall be guilty of a violation.
Moving a boat to another post is not letting it loose.
And when it comes to the Mailboat incident, I am still not guilty. My actions were willful but not malicious, I was kindly helping him correct his error.