I think it's reasonable for the hijackers to take passports with them, although it doesn't look very damaged. Here's Saeed Al Ghamdi's passport:
You can find a (nearly) complete list of the hijackers' documents found at the crash sites here:
http://journals.democraticunderground.com/KJFI'm more worried about what was in Atta's bag. Why would he be taking 16-month old administrative documentation from Germany?
Put that together with this and what have you got?
October 7, 2001: Stolen 9/11 Documents Appear in Mysterious Circumstances
On this day, Zeljko E., a Kosovar Serb, enters a Hamburg, Germany, police station and says he wants to turn himself in. He tells the police that he has robbed a business and stolen piles of paper written in Arabic, with the hopes of selling them. A friend of his told him that they relate to the 9/11 attacks. The 44 pounds of papers are translated and they prove to be a “treasure trove.” The documents come from Mamoun Darkazanli’s files, which were not in Darkazanli’s apartment when police raided it two days after 9/11. “It makes for a great story. A petty thief pilfers files containing critical information about the largest terrorist attack in history and dutifully turns them over to the police.
agents do not buy this story for a minute; they suspect that some other Secret Service was trying to find a way of getting evidence into hands. The question is, whose Secret Service?” Some German investigators later suggest that the CIA was responsible; there are also reports that the FBI illegally monitored Darkazanli after 9/11.
http://www.cooperativeresearch.org/entity.jsp?id=1521846767-1557