How Can an Unfinished Book Win the National Book Award?

Well, okay, "unfinished" is technically inaccurate, and odds are it wouldn't win anyway, but as Jim Dwyer's NYT article from last Friday makes clear, The 9/11 Commission Report nominated for the NBA's nonfiction prize doesn't contain the complete report. The unpublished material, concerning "broadly inaccurate accounts provided by several civil and military officials about efforts to track and chase the hijacked aircraft on Sept. 11," and hasn't been finished, suggests Mark Carallo of the Department of Justice, because the commission filed it too late:

The monograph was submitted to the Justice Department just as the commission's term expired on Aug. 21, a date selected by Congress after long negotiations to avoid bringing out the commission's report at the height of the presidential campaign.It arrived not only as the commission became legally defunct, but also as many commission members and the staff lost their security clearances, Mr. Corallo said. That meant no one from the commission could discuss with the Justice Department lawyers how to edit material that needed to be changed for security reasons, he said.

Setting aside for the moment why the current administration might want to sit on "a detailed timeline of the movements of the hijacked planes the morning of Sept. 11 and the response by the civil and military aviation officials" that might well reveal that a bunch of government officials lied in their testimony to the commission, let's focus on the purely literary angle: If this important-sounding chapter isn't in the Report the NBA's nonfiction judges are currently reviewing, should the Report be disqualified because it's incomplete?