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Perhaps if you contact the instructor he could issue you a replacement certificate.
All his info was in the firebox with the certificate.
Was he an IP here? perhaps if you remember where you took the class we could help figure out who it was.
Maybe he knows who it was.
if you can't, take the online class and be done with it.
It used to be very cheap. Now 76 bucks but cheaper than NRA Basic Pistol
Sounds like they accepted it