Not sure why you crossed out state authorities. The state park rangers are probably the ones with more feet on the ground and more attuned to what is really happening in the woods that we research in. It would be the state rangers, rather than Federal, that would get a phone call from frightened campers or hikers about what they saw or encountered.
Having said that, I'm not quite sure how much time they actually spend looking for footprints, following up on reports, or being out there in the darkest hours of night trying to hear and see things.
I know in my state, the park rangers are spread very thin and are chasing down reports of loud campers, poaching, stopping hunters to talk with them and check licenses, following up on injured animals, and many more things on their checklist. The last thing they have time or probably inclination to do is chase down someone who said they saw a footprint, heard a growl, or witnessed a tall, dark, shadowy figure around their campsite.