Silsoe
On the subject of Atta's passport, I think this story has been generally discredited over time. It was current literally a few days after 9/11, but I don't think it stood the test of time. I think this is discussed and dismissed in the 9/11 Commission report, a copy of which I have beside me, but the book inconveniently doesn't have an index (as good as it is in other respects), and I have no time to trawl through it for that detail.
As for the FDR and CVR boxes, my assumption is that they were consumed in the fires and destruction at the WTC.