If I have registered with FDA but am not required to do so, do I have to cancel the registration, or will FDA cancel the registration?

Yes, you must cancel your registration within 60 calendar days of the reason for cancellation (see
21 CFR 1.235(a)). However, as specified in 21 CFR 1.241(c), we will cancel registrations if we
independently verify that a facility is not required to register.