Dear Ms. Spaulding,
Thank you for posting your request on History Hub!
Not all inmates who were in custody prior to 1982 were keyed into the Bureau of Prisons (BOP) inmate management system. Since many older BOP records are held by the National Archives Records Administration (NARA), the BOP is in the midst of transferring pre-1983 inmate records to NARA. Please contact Lindsey George, Records Manager, Bureau of Prisons, 400 First Street, NW, Room 6009, Washington, DC 20534 via LEIza@bop.gov and request the specific location of the inmate records at FCI Butner for the date you are interested in prior to 1983 and what the records transfer number is.
We hope this is helpful. Best of luck with your research!