Massachusetts General Laws Part II. Real and Personal Property and Domestic Relations (Ch. 183-210) Ch. 200A, § 4

Subject to the provisions of section one A, any deposit of property made to secure payment for services rendered or to be rendered, or to guarantee the performance of service or duties, or to protect against damage or harm, and the increments thereof, shall be presumed abandoned, unless claimed by the person entitled thereto within three years after the occurrence of the event that would obligate the holder or depository to return it or its equivalent.