Mass. Gen. Laws ch. 64H, § 6A
(iv) any excise erroneously or improperly collected by a vendor shall be remitted to the department of revenue; and (v) vendors shall continue to comply with all reporting requirements imposed by law or by regulation, including, but not limited to, the requirements for filing returns under chapter 62C. Eligible sales at retail of tangible personal property pursuant to this section shall be restricted to those transactions occurring on a designated day. Transfer of possession of or original payment in full for the property shall occur on a designated day. The following transactions shall be ineligible for the purposes of this section:
(d)