Here is the opinion in Cross v. Fox (D.N.D.):
23 DCt Order
Briefs are here.
Here are the materials in Debraska v. Oneida Business Committee (E.D. Wis.):
2 Motion for TRO
11 Motion to Dismiss
13 DCt Order
Here are the materials in Goodface v. Lower Brule Sioux Tribe 2020 Election Board (D.S.D.):
1 Pro Se Complaint
5 DCT Order
Here is the unpublished opinion in Winnemucca Indian Colony v. United States.
Lower court materials here.
Here is the opinion in In re Tiger (Muscogee (Creek) Supreme Court):
News coverage here.