I have a couple of yellow SNES consoles at home, one I bought when the system came out, the other one I picked up cheap to perform the 50/60hz and region mods on. I'm seeing some SNES consoles for sale, which are mint/new, and haven't turned yellow (yet). If a SNES hasn't turned yellow yet, can I assume that it will stay grey when preserved in box? I remember somebody posting in a thread that he had 2 systems he preserved, but only one turned yellow. I don't feel like messing around with retro-brite and such.