Gee, Dick Cheney and Don Rumsfeld seemed awfully sure about where they were before we invaded.
Why not ask them?
I don't recall them saying they knew where they were. I do recall that the UN inspectors had obtained records from the Saddam regime that showed the production of 1000s of tons of anthrax, sarin, and XV. The Bush Admin did mention that and that the Saddam regime had not verified the destruction of those WMDs.
Do you have a link to a source that says the Bush Admin knew exactly where the WMDs were located?