The story of the missing 380 tons of high explosives from Iraq is turning interesting. The evidence seems to suggest that the cache went missing sometime between March 15, 2003 (the date the UN Nuclear inspectors left the area) and April 3, 2003 (the date the US Troops arrived at the base.) It also seems likely that both of these dates were common knowledge prior to the initial reports of the story, which would undoubtedly lead to speculation regarding the motives of (once again) CBS. In fact, there is some indication that an embedded reporter for NBC corraborates the military’s version of events, supporting the claim that the explosives were gone when troops arrived.
You can read a detailed accounting of this issue, including an enlightening timeline, at MSNBC.