When you think about the rather poor history our government has with keeping secrets
I really doubt they could hide this big of a deal.
I have seen a few things in the sky that I could never identify. Not spaceships, just things, odd things.
If they are out there and watching, I'm sure it's like those natives in the remote jungles that science wants to study. Every so often some dufus flies over just to see the hicks and get a laugh, but other than that we are a giant ant farm.