I guess they were hoping that nobody will raise the question of their authenticity, and for weeks, nobody did.
As long as documents make Bush look bad, they are accepted unquestionably.
But you should try to pass some fake memos justifying Bush's decision and the whole media would be sreaming that they are phony.
Someone should "find" some of Saddam's memos about how he conspired with the UN inspectors to hide his WMD, and you would see that the first point the MSM would make is that those memos are fake. Actually those were more likely to be "fake but accurate", than the ones the keep coming up with it to hurt President Bush.
That's a very good point. Whenever the MSM gets "leaked" a document that hurts Bush, they tout it as real. But give us a document saying Saddam had WMDs, and those pointy-heads will screw it over.