In Betrayal at House on the Hill, after a successful haunt roll reveals the traitor, will the heroes' team have the omen items in their possession taken away?

In the American-style exploration horror masterpiece "Betrayal at House on the Hill: Third Edition": when a new omen card is revealed and the haunt roll succeeds, the scenario officially begins and the traitor is established. As the heroes each go to a safe room to study the survival manual, will the omen item cards the heroes previously found in their possession be confiscated by the traitor?