961 CMR, § 2.37
As soon as practicable after each drawing, each Sales Agent shall post in a prominent and conspicuous part of his or her business location in full view of the public the winning Lottery numbers and serial numbers. If a license covers more than one location, the posting of the winning Lottery numbers and serial numbers shall be displayed in each location for which the Lottery license has been issued and in accordance with 961 CMR 2.37. The winning Lottery numbers shall remain posted until the next Drawing and new numbers are available to be posted. Each Sales Agent shall fully cooperate to give the public exposure and type of display of the winning Lottery numbers in his or her locations as may be requested by the Director from time to time.
961 CMR, § 2.37