Nothing contained in this subchapter shall prevent:
(1) The possession of imported green pelts which were lawfully taken and exported from another state or nation which have attached positive proof in English of where and when they were taken and marked or tagged in accordance with the requirements of that state or nation.
(2) The killing of lawfully taken furbearers with a firearm as prescribed by regulations of the commission.
(3) The lawful taking of furbearers by any resident of this Commonwealth 12 years of age or older after first securing a furtaking license.
(4) The sale of pelts or carcasses of lawfully taken furbearers.