Here are updated materials in Confederated Tribes of the Chehalis Reservation v. Mnuchin (D.D.C.)::
Case tag here.
UPDATES–
Here is the complaint in Ute Tribe of the Uintah and Ouray Reservation v. Mnuchin (D.D.C.):
Here are the materials in Cheyenne River Sioux Tribe v. Mnuchin (D.D.C.):