Answer

In principle, yes. But of course, first one should try to stop him and rebuke him. After that, tell him that you are going to report it to the boss. And if all this does not help, there is an obligation to report it under the law of returning a lost item (or “do not stand idly by your neighbor’s blood”). However, there is room to be lenient where you believe that you yourself will pay a high personal price for it (from the other employees, for example), since your life takes precedence. The situation is sensitive, and it should be considered with appropriate care.