Mass. Gen. Laws ch. 42 § 2
The boundary markers of every town shall be located, the marks thereon renewed, and the year located marked upon the face thereof which bears the letter of the town locating its boundary, once every five years, by at least two of the selectmen of the town or by two substitutes designated by them in writing. The marking shall be made with a paint or other suitable marking material.
The proceedings shall be recorded with the town clerk and the board of selectmen of the town in writing signed under penalty of perjury setting forth which boundary marks were located, and those which were not located. A copy of such records shall also be sent, by registered letter, to the town clerk and the board of selectmen of any contiguous town.
Mass. Gen. Laws ch. 42, § 2