Batter's box

[collinb]

If I use a magnifying glass on page 11 of the NFHS rule book I can see that the batter's box is suppose to be 3 ft. by 7ft.
I see high schools that appear to be taking liberty to shrink that box down considerable when marking their field.
In ASA summer travel leagues we are lucky to see any box at all marked on the field.
Do I use the markings supplied by the home team or use my judgement based on markins or lack of?