I remember reading Ralph Barker's "Great Mysteries Of the Air" in the 1960s which highlighted, amongst others, Amelia Earhart's disappearance. In that book it said that garbled radio transmissions were received for 7 days after her disappearance and were contradictory and it became very clear they were from hoaxers. It would be easy to cherry pick some of the radio calls to prove one's theory that the plane was floating or marooned on an atoll. KHAQQ was not a secret and should not be used to verify that the calls were genuine.