1. The presence in any room, dwelling, structure or vehicle of any machine-gun is presumptive evidence of its unlawful possession by all persons occupying the place where such machine-gun is found. 2. The presence in any stolen vehicle of any weapon, instrument, appliance or substance specified in sections 265.01, 265.02, 265.03, 265.04 and 265.05 is presumptive evidence of its possession by all persons occupying such vehicle at the time such weapon, instrument, appliance or substance is found. 3