I know this from personal experience Canned bicuits? As long as they haven't exploded...use them! In my younger day (ie., young, always broke and a single mom working and going to school) I even used one can that had already exploded and we are still alive to tell the story.
Martha, if the pie shell was one you made and then froze, I think I would pitch it. If it was one manufactured and bought, it contains preservatives so thaw and sniff. It may be ok. By the way, if it was store bought I want you to run over to my house and I'll show you how to make one super fast and at a fraction of the cost. It always turns out great. OK?
I declare to you that woman must not depend upon the protection of man, but must be taught to protect herself, and there I take my stand. ~Susan B. Anthony