Last time, I covered the first unspoken rule of paper in Japan (never throw any piece of paper you get in Japan away). This second rule is also unspoken and is possibly more important that the first
2. If it’s an ALTs word against a piece of paper, paper trumps ALT, always.
It really doesn’t matter how unofficial the piece of paper is. It could be something drunkenly scrawled on a napkin, but if the ALT says something that contradicts what’s written on a piece of paper, by God, that piece of paper will win. This isn’t a hard tested theory yet, but I am constantly collecting proof that ALT < piece of paper.