If you think scientists would risk their jobs, their reputation and even their lives to secretly analyze and publicly uncover these things, you are sadly mistaken. There is plenty of evidence, however you will not get it in the United States. There are researchers who have gone to places like Peru where the government is not so hush hush about such things. There has been, and currently is, work being done to properly analyze these skulls and skeletons found (see video below).
However the sad fact is that most people have their mind wide shut. Any evidence will be played off, those who seek truth will be ridiculed. Cognitive dissonance does not allow for one's worldview to be altered and those who suffer from it will refuse any evidence to the contrary of what they believe. So be it. No one can force another to see what they refuse to see.
The beauty of it is, you don't have to believe it for it to be true. You can yell "hogwash!" all you want, that does not erase the truth. An atheist can disbelieve and argue against the Bible and God all they want, it doesn't make God less real or His Word less true.
If any person wishes to know the truths for themselves, they can find it.
If any person wishes to remain ignorant of a topic, that is their choice.
I am no longer asleep, no longer a drone spitting back at everyone what has been pounded into my brain over my lifetime as "truth". When you pull back that veil, what's behind it will rock your world and I do not advise doing so unless you have a firm foundation in Jesus Christ because unless you have that it will turn your preconceived world into a puddle of goo and you will not know how to recover from that.
Let those with eyes to see and ears to hear understand.
Or put your sunglasses back on and go back to sleep.
As for me, truth is what I seek, regardless of whether someone else does or not.
Whether we agree or disagree, may the Lord bless you abundantly, for we are, after all, in the family of God together. In the end, that is what matters most.