found negatives--worth $200 million?

I found an interesting article in the New York Times under the Art and Design section. A man living in California, bought $45 worth of black and white negatives, which he claims are lost negatives of Ansel Adams. He was told by an art dealer that they would be worth about $200 million, but after much controversy as to whether they really are Adams', more doubt is arising toward that idea. An unfamous photographer, Earl Brooks is believed to be the photographer, for his niece discovered some prints in her home that are quite similar to the sheet of negatives found at the garage sale. Investigation is still being done on the issue, for Mr. Norsigian strongly believes the one who created the images is Ansel Adams. A question I have is why would someone push the idea that the pictures belong to a famous photographer when they match closely to the works of someone else??

http://www.nytimes.com/2010/11/10/arts/design/10adams.html?ref=design