In other words, the notes should be inserted so that the bereaved family see the rear side of the notes when they try to extract the notes with the front side of the naka-bukuro facing them.
要するに、喪家がお札を取り出すときに、仮に、中袋の表側を手前に見ながらお札を取り出すとするとお札の裏面が見えるようになる。