In my profession as a barber, I have talked to many FS workers. They see my collection of Bigfoot stuff at my work station and after a few visits, they tend to broach the subject with me. Most of them work in different departments and don't know each other, but they all agree on one thing: Bigfoot exists. They know the creatures are out there, they know where they are likely to be depending on times of the year, they play it off as a "legend" to curtail economic and regulatory fallout, and some have seen them and would be happy to NOT see them again.
As I understand it, witnessing one is nearly a FS rite of passage in the Estacada, Oregon area. I was told that pre-dawn hours and dusk offered a good chance on Cascade Lakes Hwy. And I was told that there was a general "ignore them" rule. You don't bother them, they won't bother you, nobody has to explain or report anything.