So they are not yet National Merit Semi-Finalists, at least officially, though if their SI is high enough, it is almost a sure thing. Is their SI higher than the predicted SI of the state (you said “West Coast”, so that could be 220, 222, or 223)? If it’s 225 or higher, you can assume that your kid is NMSF, no matter what state you are in.
Remember, though, that to move on to National Merit Finalist, your kid will need to apply, and will require the signature of their principal and counselor, a confirming SAT/ACT score, good academics, and a clean record. They have the confirming score already, their academics are there, no suspensions or anything else. That means that you just need to make sure that your kid submits their applications as soon as the official results come out in September.
I have heard of kids who were not notified because of mess ups, and missed the opportunity to submit their applications, so I would recommend that, if your kid’s SI is indeed above the cutoff, and you haven’t received anything in the mail or from your kid’s counselor, contact first the school and then the National Merit Foundation to see what happened.
If you want to know more or discuss it with other people on CC - there is a forum for it, and you probably want to follow this thread: Class of 2025 National Merit Discussion