Ah, a content creator day. She also verifies what I suspected. Underage girls were also there so that makes things much more serious from a legal POV.
In the comments she said they gave the camera to the staff. Likely not a good idea if it was someone from Boutine that put it there. Should've called the police that moment and handed it directly to them. Boutine is getting dragged in the comments too. If it wasn't someone from Boutine who put it there, they better be VERY proactive. A BoutineLA account is responding in her comments, but I don't know if it's actually them responding since no verification and I'm following a different account that is actually them. The account is also saying that the girls were told to change in the bathroom, but one of the girls is saying that they were told to change in that room too. The account in the comments is saying the camera belongs to the studio owner.
In any case, if the camera wasn't theirs, they need to put out an official statement about it saying they are fully cooperating with the police. Also, never use that studio (or associated studios) again.