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Hopefully you will find what you are seeking by going to the following webpage.
Dear Ms. Balderas,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the 77 series of the Cheyenne and Arapaho Agency in the Records of the Bureau of Indian Affairs (Record Group 75) that contains birth, marriage & death records, information about schools, tribal census rolls, and tribal lands. For more information about these records, please contact the National Archives at Denver (RM-DV) at firstname.lastname@example.org.
We also located 24 series of the Eastern Cherokee in Record Group 75 that pertain mostly to Eastern Cherokee rolls and land. For more information about these records, please email the National Archives at Washington, DC - Textual Reference (RDT1) at email@example.com.
In addition, you may be interested in viewing the Index to the Final Rolls of Citizens and Freedmen of the Five Civilized Tribes in Indian Territory as it includes your grandparent, Geyarha Wildcat, Roll No. 21071 (see image 423). This index has been digitized and is available for viewing via the Catalog.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RM-DV and RDT1. We apologize for this inconvenience and appreciate your understanding and patience.
Finally, we suggest that you visit The Eastern Band of the Cherokee - Cherokee, NC website and review the webpage about Genealogy that includes frequently asked questions as well as a contact address. We also suggest you review the Cheyenne and Arapaho Tribes website provided by a previous poster.
We hope this is helpful. Best of luck in your genealogical search!