Here are 4 parts to a Roswell documentary from 1994. It includes some of the first clips of the "faked alien autopsy". (I personally believe there is real footage of the autopsy, and the fake was deliberate misinformation. And it worked!)
The U.S. Air Force came out with their explanation of what happened around the same time as this video. They had separate events that happened years apart explaining what happened. To me they were lying and doing a bad job at it meaning there really IS something to cover up.