Pushing Ilford XP2

On a recent trip, I took a camera with XP2 (Ilford's Chromagenic 400 ASA B&W film) through airport security. As I had already exposed about 5 shots on the roll and didn't want to bother removing and re-inserting the film, I asked for and received a hand inspection of the camera. Later, after having shot the entire roll, I went to remove the film and discovered that the security person had moved the ASA dial on the bottom of the camera to 1600 ASA. The film had therefore been 2 stops underexposed.

My question is: Can FP2 be successfully pushed 2 stops? Should I push it just one stop and hope the film's exposure latitude will account for the extra underexposed stop?

Any advice or information would be greatly appreciated.

Thanks

J. Dawson

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