And be it declared, That where any Deed, Certificate, Receipt, or other Instrument which shall appear or purport to have been made, given, or executed under the Authority of this Act, or of any Act heretofore passed relating to the Lands or Possessions of the said Duchy, shall have been enrolled in the Office of the said Duchy, the Enrolment in the Books of the said Office, or an examined Copy thereof, shall, in the Absence of Evidence to the contrary, and without requiring the Production or accounting for the Non-production of the original Deed, Certificate, Receipt, or Instrument, and without calling any attesting Witness thereof, be sufficient Proof of such Original, and of its having been duly made, granted, given, or executed by the Party or Parties by whom the same shall purport to have been signed or executed.