Your boss cannot ask you to hold him harmless and ask you to sign statements saying he is not liable for an injury. There is a basic principle of law that you cannot sign away your statutory rights, meaning your rights under law, and no such waiver will help your boss out. It will only make him look bad that he inisisted you sign something like that, if that's what he is in fact doing. It's hard to tell from your post what your boss is asking you to say. However, do be sure the Report of Injury is sent to the state government, Department of Labor. Your boss is required to submit this Report of Injury to the appropriate state office. Also, your boss cannot fire you because you insisted on your rights in this situation. That would be a "retaliatory firing" because a worker got injured, and I would think in most, if not all states, it's illegal for an employer to fire anyone because they got injured or insisted on their rights under state law. Please don't let your employer bamboozle you into believing that you have to keep your mouth shut or sign waivers. If your boss persists in this attitude, contact an attorney immediately!