That is a good question.
I would tell you to email the company but I think we all know their answer will be the default legaleese to protect themselves.
Know what, I think I have some Mountain House somewheres that I am sure is past due date.
Let me look around, locate it, and I will try to cook one or two up and report my findings. (i.e. if they smell obviously bad, I am NOT going to try a bite)