Sixty to seventy years ago an American girl of Mexican heritage in her late teens (15 to 18) was taken by her parents to visit relatives living in a small rural village 100 miles southwest of Chihuahua, Mexico. The girl was forbidden to enter any of the area's numerous caves and mine tunnels, but like most teenagers, she went exploring.
At the back of a mine tunnel she found a complete human skeleton lying on the ground's surface. Beside it, sticking up out of the ground, was a malformed skeletal hand entwined in one of the human skeleton's upper arms. The girl proceeded to scrape the dirt off a shallow grave to reveal a buried skeleton smaller than the human one and also malformed. She did not specify the type or degree of any of the "malformations.”
The girl recovered both skulls and kept them for the remainder of her life. Upon her death they were passed to an American man, who maintained possession for five years before passing them to the American couple who now control them.
Source: Star Child Project