Do you have the section on this? I'm not doubting or questioning you, I'm just curious if this applies to both LTCs and FIDs, or is it just LTCs.
That is the right question to ask when there is any doubt, and it is perfectly acceptable to question or doubt information without proof. Doubt anyone who answers "because I figured out", "because I know it" or "because someone told me".
Note use of term "license issued under this section" rather than FID or LTC. Note that FID, LTC and Machine Gun License are issued under 140s131.
Chapter 140 section 131(m). They even embedded a joke into that section (hilighted in green)
malegislature.gov
(m) Notwithstanding the provisions of section 10 of chapter 269, any person in possession of a firearm, rifle or shotgun whose license issued under this section is invalid for the sole reason that it has expired, not including licenses that remain valid under paragraph (i) because the licensee applied for renewal before the license expired, but who shall not be disqualified from renewal upon application therefor pursuant to this section,
shall be subject to a civil fine of not less than $100 nor more than $5,000 and the provisions of section 10 of chapter 269 shall not apply; provided, however, that the exemption from the provisions of said section 10 of said chapter 269 provided herein shall not apply if: (i) such license has been revoked or suspended, unless such revocation or suspension was caused by failure to give notice of a change of address as required under this section; (ii) revocation or suspension of such license is pending,
unless such revocation or suspension was caused by failure to give notice of a change of address as required under this section; or (iii) an application for renewal of such license has been denied. Any law enforcement officer who discovers a person to be in possession of a firearm, rifle or shotgun after such person's license has expired, meaning after 90 days beyond the stated expiration date on the license, has been revoked or suspended, solely for failure to give notice of a change of address, shall confiscate such firearm, rifle or shotgun and the expired or suspended license then in possession and such officer, shall forward such license to the licensing authority by whom it was issued as soon as practicable. The officer shall, at the time of confiscation, provide to the person whose firearm, rifle or shotgun has been confiscated, a written inventory and receipt for all firearms, rifles or shotguns confiscated and the
officer and his employer shall exercise due care in the handling, holding and storage of these items. Any confiscated weapon shall be returned to the owner upon the renewal or reinstatement of such expired or suspended license within one year of such confiscation or may be otherwise disposed of in accordance with the provisions of section 129D. The provisions of this paragraph shall not apply if such person has a valid license to carry firearms issued under section 131F.