After the payment of all sums for which the buyer is obligated under a contract and upon demand made by the buyer, the holder shall deliver, or mail to the buyer’s last known address, such 1 or more good and sufficient instruments as may be necessary to acknowledge payment in full and to release all security in the goods under such contract.

6 Del. C. 1953, § ?4323; 52 Del. Laws, c. 342; 70 Del. Laws, c. 186, § ?1;