Is the Grand Canyon hiding an ancient Egyptian civilization?

A 1909 edition of the Phoenix Gazette describes the discovery by the Smithsonian Institute of a mammoth cave system with the remnants of a civilization numbering 50,000 people. Granaries, tombs and even idols reminiscent of Buddha were allegedly found.

Of course there’s the problem that the Smithsonian claims to have never launched the expedition and no record of any of the explorers can be found. Was it a hoax? Or is there another Anasazi city waiting to be found somewhere in the Grand Canyon?

The original article
An investigation into the facts of the article
The Anasazi in Wikipedia