Okla. Stat. tit. 84 § 275
All persons named in such petition as tenants or persons in actual possession, or claimants of the property, or any part of the same, may appear and plead to such proceeding, and therein may traverse the facts stated in the petition, the title of the state to the lands and property therein mentioned as in other civil cases, and any person claiming an interest in such estate may appear and be made a defendant, and plead as in other cases, except such appearance must be made within or at the expiration of thirty (30) days from the first publication of the notice hereinabove mentioned, except on order of the court. If no person after notice as aforesaid shall appear and plead within the time prescribed by law, which shall not be less than thirty days after the first publication of notice, judgment shall be rendered by default in behalf of the state; if any person appear and deny the title set up by the state, or traverse any material fact in the petition, issue shall be made up and tried as other issue of fact; and if after the issues and trial it appears from the facts found or admitted that the state has good title to the property, real or personal in the petition mentioned, or good right thereto, or any part thereof, judgment shall be rendered that the state shall be seized and possessed thereof, and a writ for the possession shall be awarded and executed as in other cases, and at the discretion of the court the state may recover costs against the defendants, which costs shall include a reasonable amount for attorney's fees. If it appears that the state has no title to such property the defendant or defendants shall recover their costs, to be taxed and certified by the clerk, to the State Treasurer, upon which such certificate such State Treasurer is authorized to cash the same out of any monies in his hand not otherwise appropriated.
Okla. Stat. tit. 84, § 275