The buxiban where I work part time got checked yesterday for any illegal teachers. The boss at the school said all was fine and that the lady and left happy everything was in order.
If they actually searched the buxiban then there’s a good chance they could be back. Usually they only do a search if someone is pissed and tipped them off. I’ve talked to them twice and they only asked me to sign their forms in the reception area.
If you aren’t teaching legally then find a way to teach legally even if you have to leave your job.