Dummy Parachute 

In reading the article I am confused by the mention that the FBI believes that Cooper jumped using a fake parachute. If they do have a lot of evidence for this, this would seem to be a very strong indicator that Cooper is dead, and I would expect a normal article which included that to reference that in the sections about people claiming to be Cooper. The fact that it is only mentioned in a few places in the article makes it seem like it is unsubstanciated or only from one source.