It was just ka-ka.
Jonah Goldberg: What ever happened to The Most Important Story on Earth?: "Remember al-Qaqaa? This was the massive cache of explosives that American forces failed to secure after the fall of Saddam. In the final week of the presidential campaign it was The Most Important Story on Earth."
Short answer: the story diasppeared from the headlines after the election as the story was not as consequential as it turned out contrary to the media (primarily the NYT) which loved the story immediately before Bush v Kerry.