Boss Threatening To Use Our Tips To Pay For Missing Supplies

I don't think this is the right flair but whatever. So I work in food service, and I've been at this job for around 9 months and I love the work and I love my coworkers. Since I've been here there's been an issue where our BOH sauce bottles keep going missing. I'm pretty positive they keep accidentally falling in the garbage because where we stack dishes is right above the trash can (yes i have brought up just getting a lid) Anyways, my boss says because we're being so irresponsible, he's going to take money from our tips to pay for the new ones. If it makes a difference, our tips aren't handed to us directly, they're paid either on the POS or in a jar, which then just gets added to our paychecks.

Also, depending on your answers, where can I report this? My boss has a lot of respect for me so if anyone could tell him off in person and not get fired, it would be me, but I don't want to risk that. This is really the first major red flag I've seen from him sadly, but im the assistant manager so I really work the opposite shifts and never see him so I hardly have to deal with his bs, so pls don't recommend a new job, as I'm likely taking his place soon anyway.

Also, I'm in Michigan.