Ok, I know this is kind of a dumb question, but here goes: how are 50-sheet boxes of 4x5 film packed? I ask because I recently acquired a lot of film, which included some boxes (Kodak Portra and Fuji Provia) of that size. The seal on the box was broken, but inside were two sealed packets. I didn't want to break the seal to count the sheets, but it seemed like there was not much room in the box for more packets. So, does each packet contain 25 sheets or are they usually sealed in smaller quantities?