The explosives were gone once the marines got to the bunker - even the NY Times admitted that late in the article. This is absolutely a manufactured news story. And it's encouraging that this is the best the Dems could do for an October surprise.
That argument only works for the Dems: "its old news". Republicans are held to different standards. What could be older news than Bush's National Guard service - and look how long that was on the front pages again. This story will moves the polls this week - just watch.