What do you mean when you say wrapped in plastic, actually wrapped in it like glad wrap or it had a tarp sitting over it?
Can you turn the input shaft by hand, and does the output shaft turn? If it still turns then chances are it will work once you pop some oil in it and mate it to a car.. unless it got lots of moisture in it I can't see why it wouldn't work again.
As far as gaskets go you probably only need to replace a couple of seals to be on the safe side.
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