The College rule:
Hit by Pitch Rule. This rule has been clarified by the committee for this season. The batter must make an attempt to avoid the pitch. If a pitch freezes a batter and he is not able to avoid a pitch and the pitch is clearly in his batter’s box, first base is awarded. If a pitch hits the batter outside the vertical lines of the batter’s box and the hitter makes no attempt to avoid the pitch, the batter remains at the plate and the pitch is called a ball or strike.
Another way to look at this rule change, if a batter hits the ball with any part of his body by moving his body part towards the pitch, the batter will be kept at the plate and the pitch called a ball or strike, depending upon the pitch’s location. If the ball hits the batter as the batter is attempting to avoid the pitch, the batter is awarded first base. This guidance should assist umpires and coaches with the adjudication of this rule. `copied from some website about ncaa baseball
The high school rule makes no mention of the batters box (unless I am mistaken)... The point of the batters box is important and makes it easy on the umps. If the kid stands there and does not move and the ball hits him in the batters box; he gets first. If the ball is not in the box, it's a ball or strike and he's still up there.
(a few days ago a kid threw a breaking pitch behind my right handed hitter; he stood there and the ball hit him in the back of his right heel: the umpire says, "nope, stay right here he didn't make an attempt" )