Mass. Gen. Laws ch. 106, § 9-208
(b) Duties of secured party after receiving demand from debtor. Within 10 days after receiving an authenticated demand by the debtor:
(2) a secured party having control of a deposit account under Section 9–104(a)(3) shall:
(3) a secured party, other than a buyer, having control of electronic chattel paper under Section 9–105 shall:
(6) a secured party having control of an electronic document shall: