Yes, you're right. Still, our officials have been flip-flopping on whether or not the meeting actually took place. It doesn't seem likely that we have any concrete proof, which makes those who claim the meeting took place look desperate. I, for one, hope it took place, and that we CAN prove it. It would make the case for war that much easier.
The only officials who have questioned the Prague meetings are the "officials who prefer to remain anonymous" serving as sources for some in the mainstream media.
The Czech government, however, has firmly stood by the reports. In particular, two highly placed ministers, the Interior Minister and the Ambassador to the UN, have unequivocally stated their reports are fully substantiated.