The most common is that the inmate is currently in transit. When a federal inmate is being moved between facilities, the BOP system temporarily reflects the transit status rather than a specific location. This can last anywhere from a few days to a few weeks depending on the transfer route and whether stopovers are involved. The Federal Transfer Center in Oklahoma City is a common hub, and inmates can be there for a week or more before reaching their final designation.
The second possibility is that the inmate has been temporarily transferred to a state jurisdiction to face additional charges. If Alabama or New York has active charges and the inmate was shipped to a state facility to address them, the BOP may show Not in BOP Custody because they are technically not currently housed in a federal facility. The returned letter from MCC San Diego suggests he was there at some point and has since been moved.
The third scenario is witness protection or other sensitive status designations, which restrict location information. This is relatively rare but does exist.
The most practical next step is calling the BOP's inmate locator line directly at 202-307-3126 and providing his name and register number if you have it. Staff can sometimes provide more specific guidance than the public website. If Alabama or New York charges are a possibility, checking those state DOC offender search systems is also worth doing in parallel.
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