A trove of documents from the now-dead cybersecurity chief of Los Alamos National Laboratory — where two of the 11 missing or dead US scientists worked — purport to show that the US government secretly conducted UFO-related experiments for decades, according to a new documentary. Reporter Jeremy Corbell claims in the upcoming flick “ Sleeping Dog ” that he received the valuable classified documents from the son of the deceased ex-cybersecurity chief at the highly secretive New Mexico lab. “Throughout my work as a journalist, I have become a central clearinghouse for sensitive [Unidentified Aerial Phenomena] material in my reporting,” Corbell said to The Post. Reporter Jeremy Corbell was provided a trove of documents that prove the government has secretly investigated UFOs for years according to a new documentary “Sleeping Dog.” Courtesy of Jeremy Corbell “It is now routine for families of deceased insiders to contact me with hidden documents their loved ones left behind,” he said.…