The chances of survival are not good.

Compare the amount of time the sheets were out of the package to a normal exposure time (1/125 or whatever).
You're probably looking at many stops longer exposure during the accident.

Shoot one from the middle of the stack and one from the bottom and see how they look.
Most likely the edges will be fogged. It's all a question of degree.
If the central area appears uncompromised, you can probably shoot with a reduced image area and use the film.

- Leigh