Meaning they have an open case they're investigating? Some one must have already been charged unless the AG office has greater powers than other LE agencies when it comes to information access.
That's an interesting question.
From DCJIS
The following is an excerpt from the Massachusetts Public Records law (M.G.L. c. 66, § 10(d)) regarding firearms license and ownership information:
The commissioner of the department of criminal justice information services, the department of criminal justice information services and its agents, servants, and
attorneys including the keeper of the records of the firearms records bureau of said department, or any licensing authority, as defined by chapter one hundred and forty
shall not disclose any records divulging or tending to divulge the names and addresses of persons who own or possess firearms, rifles, shotguns, machine guns
and ammunition therefore, as defined in said chapter one hundred and forty and names and addresses of persons licensed to carry and/or possess the same to any
person, firm, corporation, entity or agency except criminal justice agencies as defined in chapter six and except to the extent such information relates solely to the
person making the request and is necessary to the official interests of the entity making the request.
Therefore, based upon state law as cited above, the DCJIS will not disclose the names and addresses of those who possess firearms licenses or firearms, rifles, shotguns, machine guns, or ammunition to ANY individual or entity
. The only exception to this policy is that such information will be disclosed to law enforcement and criminal justice organizations and personnel when that data is sought for legitimate criminal justice purposes.