They couldn't have covered their tracks THAT well, could they? Bear in mind that they had well in excess of a year, almost a year and a half actually.
Also, Stephen Hayes at the Weekly Standard wrote an article not that long ago in which he said that our government isn't even remotely close to having translated all of the audiotapes and written documentation that we recovered in Iraq. We've apparently only translated a small fraction of it, which is rather amazing, but we have a definite of shortage of people in America who have both the skill set and the desire to do this kind of work.
"Bear in mind that they had well in excess of a year, almost a year and a half actually."
And, it's even longer than that when you consider the previous inspections and scrutiny Saddam was under for more than a decade. As David Kay noted, while they may not have found "stockpiles" of WMDs, Saddam was embarking on a different strategy as it related to his weapons programs.
It was no longer prudent for Saddam to just keep large quanitities of the finished product for anyone discover. Instead of importing and stockpiling, Saddam began acquiring the raw materials and technology to produce the product, himself, whenever needed.
As Scott Ritter even noted in 1998 (during his sane days), Saddam was putting the pieces in place so that he could reconstitute his weapons program in a matter of months. After being bombed for years and suffering through inspections, it only makes sense that Saddam would forego the "stockpile" risk and engage in a process of raw development that could be deployed in short notice.
It should be noted that David Kay is also one of those who says that Saddam did move much of this material to Syria. During an interview while he was in the UK, he specifically mentions this from interviews he gather after the invasion. When you consider these sources and those from Israeli Intelligence, it's a good bet the WMDs are in Syria.
If I recall, there was even a story of WMDs discovered in Jordan, which were thought to come from Iraq via Syria since neither of those countries had the resources to produce those materials. I think it's only a matter of time before this charade is exposed.