As you can see, the origin of the "Alien" figure that many recognize was a mere transformed state of the "true" alien. This particular footage was taken of one of the victims from the Roswell crash. The transformation was induced in the crash victim by removing a small circular article that was stuck to its backside. Upon closer inspection, the words "Grown in California" were said to appear. I assume that this fact is false, and merely a hallucination of one of the scientists working on the corpse.
Also we can see that this "true" footage dismisses that the the so-called "Alien Autopsy" ever really existed. Obviously it was created by the Fox network (or someone else) to gather ratings, which it did in its three airings on the television network. While it may be said that this act was harmless in that it created entertainment for the masses, the reality of the situation is that the "Alien Autopsy" video was planted on purpose.
Yes, the facts show that the truth of the incident has been covered up. This was done by leaking information stating that only a small number of aliens visited us, and that they were killed in the crash. This lead us to believe that the aliens have been dead for the past 50 years. Sadly, nothing could be further from the truth...