Do what Samc recommended above. If it smells fine, then I wouldn't be afraid to use it. I mismanaged my brewing supplies once. I left a pre-crushed California Common recipe sit in a box in a corner of my basement a little over 7 months - Wyeast pack and all. My basement is finished and generally very dry. First concern was mealy moths - none present. Yeast didn't activate. I went ahead with my brewday and was surprised that I hit only 2 points low of the target OG. I pitched an American Ale yeast I had on hand. I called it my California Common Gone Wrong, but it was one of the better brews I have done. Mistakes can occasionally turn up pleasant surprises!