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I am not certain what you mean by sealed records, but this is the FBI site that tells one how to make a FOIA request.
The only way that I have been able to determine if other agencies had records, was to look at the records from the first agency I found and look at where they got their information or who or what agencies were in the cc list on letters. Then I would request or look for those agency's records.
Thanks so much. This person as well as those connected to him have very few records. I had an attorney friend give me their opinion and their conclusion was that he may have been a government informant.