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.):
106-1 Second Amended Complaint
113 Motion to Dismiss
124 DCT Order
Prior posts here, here, and here.
Here are the en banc stage materials in United States v. Abouselman:
En Banc Petition
Order Denying Petition for Rehearing
Panel materials here.
Here is the opinion in United States v. Abouselman.
Briefs and lower court materials here.