I'm very skeptical about this story. Since it comes from a tinfoil hat site, I suspect it's simply not true. Always consider the source.
See! PROOF that 9/11 is a cover up and W planned it all! I am so smart!
Why would someone fabricate such a story?
I have agree, it would be extremely unlikely that three of four black boxes would be discovered while traversing the site in an all terrain vehicle. I guess they are claiming that the boxes were just lying on top of the rubble in plain sight.