N.Y.C. Admin. Code § 28-410.5.4: § 28-410.5.4 Failure to obtain seal.

If a holder of a certificate of competence has held the certificate for five (5) years without a seal, then the commissioner may require said person to submit an affidavit and supporting documentation satisfactory to the department stating that over the five (5) year period the individual has been engaged in the performance of fire suppression piping work, including the planning or design of fire suppression piping systems in the United States under the direct and continuing supervision of a licensed master fire suppression piping contractor. If the holder's qualifications are not satisfactory to the commissioner, the commissioner may require such person to submit to reexamination or to provide evidence of retained proficiency. Additional fees will be due, as set forth in this chapter.