Depends what they will spray...
I have to say as long as the paper is in the box and the bag is folded around the paper in the box I cannot think it would come to any harm.
Some airborne contaminants can cause issues ( ever looked at an unprotected but genuine monochrome print in a hairdressers ? ) for processed paper, usually 'bronzing', but its rare.
Simon ILFORD Photo HARMAN technology Limited :