The guidance is posted on the WIAA web site. Look for a document called "Washington Wrestling Weight Management Program".

I'm not expert, BUT:

Without any other info, I would say he should be "Locked in" at 150/157 as his two authorized weight classes. But your post is pretty lacking in detail. Was the lowest he ever competed at was 157 and when he competed at 157, did he ever weigh in lower than 150? If he competed at 157, but weighed in at less than 150 those days, he preserved his two original authorized weight classes of 144/150.

There is some situational stuff that is relevant in the rules (timing, descent plan stuff).

Also, reporting follows a self reporting model for violations. And if caught not self reporting, you are in violation of WIAA rules. Not sure what happens then.

Hope that helps, but the earlier poster was right, call a coach.