Batted Ball in Batters Box

[boppster]

Need a ruling on the following situation:

Batter's box is not clearly defined (no inside lines, only outside lines leading up to foul line).

Batted ball hits in front of home plate and rolls forward and left. The umpire ruled a foul ball, citing in his judgement the ball came to rest inside the batters box (but in fair territory). Later on in the game a batted ball came to rest directly in front of home plate - fair ball.

Since a portion of the batters box is in fair territory, was the judgement of the ump correct: any ball that comes to rest inside the batters box (even judgement calls) are foul?

Thanks,
Kevin J Bopp