Well at least I still have a nice box and a black plastic bag *
effin effin eff
* useful for traveling by air with medium format film, btw -- the TSA like to cut open all the little foil pouches provided by Kodak and Ilford. So I open them in advance and put the rolls in black plastic bag. Makes it easier for TSA to inspect without TOO much undue exposure.
I only had to do this once to decide to start labeling the outside of of my paper boxes. (still, I shouldn't put my sorted prints/art papers etc. on the same shelf as my fresh paper... it's inviting disaster)
I did the opposite recently, I have a brovira box that had I carefully taped shut some time ago, moved a few times, and now that I have a darkroom, felt ready to try it out and see if was still good.
I opened the box in the dark and found it full of old prints instead of unexposed/unprocessed paper.
I've had that happen but it only ruins the first few sheets and halos the edge of most a tiny bit. Otherwise useable. Paper doesn't transmit light so well as film base.
Well, here is some good news. The paper is packed so tightly that if the package were full, there would probably only be 2 - 4 sheets at each end of the package that was fully fogged. The rest would only have edge fog, and that would be light and sometimes might only be along one edge.