Ok. first the link: vault.fbi.gov…
The above is a link to a F.B.I. PDF
In short: The Director of The Bigfoot Information Center and Exhibition (the Dalles, Oregon USA) submits to the F.B.I in the mid 70’s a patch of skin
with unusual hairs attached. In the first few pages of the PDF we see what appears to be some excitement of getting a sample that they can’t identify
and doesn’t match any known samples they have.
As time rolls on everything starts to change.