This query is the perfect example of why one should always hire counsel for a ticket. Now you don't know what to do. It's not too late to retain counsel.
Contact the court to confirm that he timely answered the ticket and they accepted the fine, then request written confirmation if it hasn't been mailed yet.
If you found this "helpful" or "best answer," please click it with my appreciation. My response is for educational purposes and does not constitute legal advice nor creates an attorney client relationship which requires all the details and a personal conference.
As attorney Caviglia suggests, contact the court.
Hold on to your written proof, you may need it if something is lost or misplaced by the court!
Christopher I. Simser, Sr.
Syracuse - Albany - Rochester