>>11821413
Thank Nintendo for cheaping out with cardboard. Even SEGA was using plastic cases for their 8 bit and even pre-NES-era systems. Nintendo however only switched to plastic cases for carts after the GBA. Considering NES/SNES games came with dust covers and it was annoying to put the carts back into the cardboard boxes many just tossed them after getting the game. This generally meant it was easy to lose the manual too because there was no real way to keep it with the game.