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I found all of the following on familysearch.org..it is a free website. You will need to register to search.
If this is your Charles Moore I did not find any information about him being an indian agent.
There are 111 Moore burials in this cemetery in Greeley
Draft Card 1918 gives Birthdate as Sept 17 1880
Draft Card 1942 gives Birthday as July 3 1880
1885 census Orin J Moore father of Charles born New York
1940 Census divorced...no job listed-living with sister-in-law
Dear Terry Moore,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 131 record series relating to the term “Indian Agent” between the years of 1880 and 1900 in various record groups. You may wish to review these descriptions to see if any might be relevant to your research. For more information about particular records, please email the reference unit listed as the contact in the Catalog description.
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. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research!