This people and fight ehn

i understand that u are in dilemmatic situation but the best option i can offer to you is to get a new job at all cost,because if you think of sending an anonymous letter to your boss the culprits would still know its you they aren't so dump and it could backfire in future or if you disclose their malevolent act to your boss and they are apprehended by the police they could make false claims of you being their accomplice because you were cognizant of their atrocities and that you decided to snitch on them because of some money issues,by then you would be sharing a bed with them in jail or if they don't accuse you wrongly and they are eventually caught and taken to court and the judge offers them bail or they spend a limited time of about 1 to 3 years in jail,have u pondered on what they could or their relatives do to you do to u as payback
And for your boss she has to be watchful and vigilant of the activities in the company,so you just need to leave.jesus said to those pple that wanted to stone mary magdalene "if any of you haven't sinned b4 be the first to throw a stone at her" was jesus not aware that she sinned,he was but still saved her, sometimes you just have to walk away from some dilemmas