Nobody,
The one thing I know for a 100% fact about my previous post is that Phoenician Gold Staters were found in a cave on the North Rim of the Grand Canyon in about 1986. The person that found them doesn't talk to anybody anymore about the subject as he has been the victim of much harassment and even spent some time in jail in relation to the find (a long story). How Phoenician Gold Staters found their way into an Ice Cave in a mountain in Northern Arizona, I can't comment. The coins were identified by Bob Marx sometime around 1990 or so.
As far as the plates at the airport in Merida, the story was in a book I read a loooong time ago. I have contacted the airport, and a couple of the construction companies that built it. I found a couple of people that remembered the incident, but after Academicians declared the plates fakes they lost interest.
Mike