Check to see if your company has a written policy against weapons. I personally would not ask my employer but would investigate written policies.
Also, remember all of the places you cannot carry, i.e. schools, federal buildings, court houses. Your LTC (unrestricted) applies 24 hours a day regardless of whether or not you are working.
even if your company has a no weapons policy you arent breaking any laws, and getting fired is not as bad as getting killed. If you keep it concealed you should have no problems unless you are in a position that you do need to use it.
You cannot be prosecuted for simply violating company policy in MA (some states have "binding signage" law - MA is not one of them), but there is no protection against "firing for cause" if you violate such a policy.