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TIL that the 1972 'D.B. Cooper' hijacking cash had serial numbers recorded, but the FBI only publicly released a tiny fraction of them.
I was reading an old FBI document dump and saw they logged over 10,000 serial numbers from the ransom money, but have only ever confirmed about 300 of them were part of the official public list, so where's the rest of that data and why keep it quiet?
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