Here is the complaint in Chickasaw Nation v. Caremark CVS (E.D. Okla.):
Most of the other pleadings are sealed.
Here are the materials in Caremark LLC v. Chickasaw Nation (D. Ariz.):
1 Petition to Compel Arbitration
13 Motion to Compel Arbitration
And here are the briefs so far in Caremark LLC v. Chickasaw Nation (9th Cir.):