Nah, we all know the government would never cover up anything! LOL!
As for taking a specimen, that's not for the faint of heart, nor the foolish. Of course, the same could be said of anyone that's willing to don a suit and traipse around in the woods.
I hear MANY accounts of the creatures being as thick as hair on a dog's back all over the place. They steal all of the fruit out of orchards, communicate with humans by using telepathy, put pine cones on top of cars to convey a special message... heck, there are some that can't even step off of their back porch without stumbling over the entire lot of the creatures that are there to gift crystals, etc., as well as to collect the gifts that they receive from the human "sages." Couldn't one of these "Squatch Whisperers" at least take a clear photo of one of the many in the troupe?
If we can't even get a clear photo or any genetic evidence when these things appear to be all over the place, we'll never obtain a body (harvested or already dead) unless we take a chance on shooting a fool in a suit, or unless someone is lucky enough to find a body.
Wait - Is that a black van in the driveway? LOL!