Sorry SRR, I cannot back you up on that.
No, I'm almost positive Fanueil Hall security has red stripes on their pants.
All Boston Municipal officers have dark gray stripes. Only patrol officers are assigned to Fanuiel Hall at this time, but site officers were allowed to patrol there in the past. The word "Police" was removed from the site officer patch and badge about 3 years ago, so it definately wasn't a Muni site officer. If it was Muni a patrol officer, some of them wear approved uniform pullovers that do not have patches sewn onto the sleeves.