Here are the materials in Comanche Nation of Oklahoma v. de la Vega [formerly Zinke, then Bernhardt, and now should be Haaland] (W.D. Okla.):
Here is the petition captioned Comanche Nation of Oklahoma v. Zinke [but presumably will switch to Comanche Nation of Oklahoma v. Bernhardt]:
Whether the “former reservation” exception permitting lands acquired by the United States in trust for an Oklahoma Tribe after the effective date of the Indian Gaming Regulatory Act of 1988 to be devoted to gaming purposes, is applicable to lands not subject to Tribal jurisdiction prior to the acquisition.
Lower court materials here.