I think as long as they are still green and don't smell cheesy, you can still use them. Were the opened bags sealed with air in them, or vacuum sealed? That could make a difference in freshness.
On Deck: Jamil's Vanilla Robust Porter
Fermenting: Orange Blossom Mead
Kegs: Element 56 Pale Ale, Ron's Belgian Blonde, Summer'n Saison, Furloughktoberfest '09, Grateful Pale Ale, Sam Adams Cream Stout Clone, EdWort's Apfelwein