FBI 164-81, Vault Part 22 p. 334 (DB Cooper-6684), Letter — cooper.theunsolved.net/parts/Cooper-Part-22/pages/334
Transcript
The scan is the source; the transcript is machine-generated from it.
Wearing Apparel: Black or brown suit; white shirt;
narrow black tie; black dress
suit; black rain-type overcoat or
dark top coat; dark briefcase or
attache case; carried paper bag
4"x12"x14"; brown shoes
Remarks: Very polite at all times.
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Considering the possibility that the hijacker might
not have survived his departure from the plane, you are
requested to review your missing persons files for reports
of a white, male answering the description of the hijacker,
where the circumstances of his disappearance would suggest
him as possibly identical with the hijacker.
In view of the fact that the hijacker threatened to
detonate the bomb he allegedly carried, any suspect should
be considered armed and dangerous.
Any agency having information which might assist
in identifying the hijacker, should contact the nearest
office of the FBI, collect.