Okla. Stat. tit. 58 § 83
When a lost or destroyed will is established, the provisions thereof must be distinctly stated and certified by the judge of the district court, under his hand and the seal of the court, and the certificate must be filed and recorded as wills are filed and recorded, and letters testamentary or of administration with the will annexed, must be issued thereon in the same manner as upon wills produced and duly proved; if the court has admitted into evidence a copy of the lost or destroyed will and finds that the copy distinctly states the provisions of the will, the court may certify the copy of the will as distinctly stating the provisions of the will; the testimony must be reduced to writing; signed, certified and filed as in other cases, and shall be admissible as evidence in any subsequent proceeding.
Okla. Stat. tit. 58, § 83