We may not have known how they were deployed on a given day. But the Iraqi commanders in the field had to know--else they couldn't have employed them within 45 minutes. So they couldn't have been buried too deep, and some of the Iraqi military had to know where they were. The more people who know a secret, the less of a secret it is. By now interrogations should have yielded something--why haven't they?
Let's try this one last time: A weapon system is capable of being deployed in 45 minutes if it is able to be taken out of its current storage mode, set up and fired in 45 minutes. That does not mean that it need be available to do so. It is a genreal statement based on the weapon system, and is irrelevant to the weapons location. The description does not care that the weapon system is on a rocket site on Tuesday, and has been put under 50 other like weapon systems in a warehouse 300 miles away on Thursday, nor if the crew gets drunk out of their gourd on Friday and is incapable of assembling it until they get over their hangover. If you want to say that he used a standard military description and that people might be able to confuse themselves with it, then you may have a point, but failing to be immune to misinterpretation while stating it in common terms is not the same as being misleading.
As for "The more people who know a secret, the less of a secret it is. By now interrogations should have yielded something--why haven't they?", why haven't they figured out where the chemical weapons Iraq admitted to having went? As for the commanders having to know: Not hardly. After having so many security leaks, Hussein really cracked down on who might know. The chemical warheads being spoken of only hold a couple of liters apiece, and the total (lower end) amount that Powell described Iraq as having could fit inside of but two large tanker trucks. Further: Technically it is possible that no one still alive actually knows where the bio or chem weapon agents are.