Kohunlich: click red arrows to view masks under the thatch [Dec. 31, 1997]
In 1969 looters reportedly discovered the site, removed some of the outer covering of Structure I, and revealed the masks. Ignacio Ek, of the nearby village of Francisco Villa, came across this work and reported it to authorities, who then took steps to protect the masks and the site, which was known locally by the name Kohunlich at that time.
Joyce Kelly, An Archaeological Guide to Mexico's Yucatan Peninsula, p. 291
Note the guard sitting at the top of the staircase on the right.