Kane scored in overtime to beat the Flyers in Game 6 at Philadelphia in June. The puck has been missing ever since.
Chicago FBI spokesman Ross Rice told the Chicago Tribune that the bureau is helping with the search.
"The people who are doing this are doing it on their own time," he told the newspaper. "They feel they are a part of history."
The paper reported that local restaurateur Grant DePorter, CEO of Harry Caray's, offered a $50,000 reward for the puck and has been leading the efforts to find it.