I'm not sure about the camera, as it's essentially a mechanical contraption, but the flashcubes ought to work unless the hotshoes or whatever contacts on the outside get corroded badly. The magnesium filaments inside should still be able to burn if juice gets to them because magnesium oxidizes only on the outside (unlike iron, which rusts all the way through) and protects the rest of the metal.
And just nosy, but what kind is it, a Kodak Instamatic, or a Polaroid or something like that?