Yes but then you now have a real Banksy that will be labeled a fake because the fake print #18375 has a letter of authenticity while your real #18375 does not.

Yes but then you now have a real Banksy that will be labeled a fake because the fake print #18375 has a letter of authenticity while your real #18375 does not. You would need to get Pest Control to keep issuing certificates for the same print, which they probably won't do.