If an employer theoretically ended up with a few hundred employees without a valid, verified I-9, then I don't know about "legally required", but if they weren'

If an employer theoretically ended up with a few hundred employees without a valid, verified I-9, then I don't know about "legally required", but if they weren't fired, that employer could face stiff federal penalties for not living up to their obligations. Do you see how weird this is?