Under the batter runner section of the rulebook, there is nothing regarding a batters box. If a batter runner makes contact with a fair batted ball they are out. Nfhs issued a clarification this year stating such.
If a batted ball richocets up and contact the batter or bat it's a dead ball and foul. But, if the ball is over fair territory and batter runner advancing makes contact with the ball they are out.
If a batted ball richocets up and contact the batter or bat it's a dead ball and foul. But, if the ball is over fair territory and batter runner advancing makes contact with the ball they are out.