N.Y. Pers. Prop. Law § 344

§ 344. Cancellation of agreement. After the payment of all sums for\nwhich the lessee is obligated under a retail lease agreement, and upon\nwritten demand made by the lessee, the holder of such agreement shall\nmail to the lessee at his or her last known address good and sufficient\ndocumentation to indicate payment in full. This documentation shall not\noperate to release the lessee from liability for events discovered by\nthe holder subsequent to the mailing of such documentation.\n