Should I warn my muslim roommate about pork in food he bought?

Hello, I'm not muslim myself, but have roommates that are. One of which, who's quite cordial, often offers me fruits and his cooking, and when I offer him my cooking he always makes sure that it's not haram.
The thing is, they don't speak much of our local language, and after he gifted me one of the soup packages he bought, I noticed it contains pork meat.
From what I gathered, pork consumed without one knowing it contained pork is not prohibited, but I should warn him about it, correct?