Found this thread while searching for a forum for other NES collectors. I don't seem to have any of the rare cart variants, but I do have one of the SMB 3 Challenge Box boxes with the sideways sticker. Unfortunately as a kid I tried to take the tape off and maybe half of the tape is ripped off, with some of the box as well.
Does anyone know how much a good condition box with the sideways sticker has sold for? Or how rare it actually is. Just wondering how much childhood me cost present me haha. Couldn't find any listings on ebay for it.