I'm made a pinhole camera with brown matt (yes, the same materal that boxes are made of) paper.

It's a very delicate design and I guess it's too late to color the interior black.

I'm using instax wide(Fuji version of Polaroid)

And its light tight so there won't be any lights coming in from anywhere but (of course) the pinhole.

What should I expect? Would the light from the pinhole hit the walls and bounce to the film and make it messy?

Any opinion is welcome,

Thank you in advance.