I have had three very respected dowsers that dowsed this story and they have all came to the same conclusion.
Actually Forrest Fenn claims he placed the fabled bronze treasure chest north of Santa Fe, New Mexico 5,000 feet above sea level. There are literally millions upon millions of square miles of land that is 5,000 feet above sea level north of Santa Fe (the lower 48, Canada, Alaska, etc.) If you are searching for it, good luck to you.