N.Y.C. Admin. Code § 22-262: § 22-262 Surrender of registration certificate and photo identification card and cessation of use of registration number.

Suspension or revocation of a registration shall require the immediate surrender to the commissioner of the registration certificate and all photo identification cards issued for employees of the registrant. Suspension or revocation of a registration shall also require the immediate cessation of use of a registration number. Suspension or revocation of a photo identification card or discontinuance of employment in the market shall require the immediate surrender of such identification card. Violation of the provisions of this section may result in revocation of the registration or photo identification card where such registration or identification card is under suspension or in criminal or civil penalties as provided in subdivision b of section 22-258 of this chapter.