I'm awake .. and urging a little caution in your assumptions. Lets suppose for a second that gov't in its various forms does know of bigfoot existence. If they already know from DNA that BF is some kind of person, not a dumb animal, then all fish and game agencies, state and federal, are outside their jurisdiction. The only agency that MIGHT have any authority would be the Bureau of Indian Affairs within Department of Interior .. and even that requires assumptions to assert which may not be true. Lets suppose, just for the sake of Tuesday afternoon goofiness, that bigfoot are indeed people. What if we already have a treaty with them and one of the stipulations is "no disclosure?" That would explain a whole lot of otherwise wackadoodle government behavior, huh? That treaty would then require that gov't couldn't admit that such a treaty existed.
(Nah, I don't really believe it, but we gotta consider all the angles .. I think?)
Have a good 'un ... I'm going back to sleep.