I don’t know your roommates obviously, but if someone were to get a package I think it’s a fairly innocuous question to to ask the recipient of a package what is in it. I probably would just to make conversation. Perhaps if you had simply answered truthfully about the contents it could have started a conversation rather than putting you in an adversarial role. I’m not saying this to criticize, but just as an opportunity to find a way to better communicate with the roommates.