4. The person responsible referred to in paragraph 1 shall notify the competent authorities of the first Member State of transit that the radioactive waste or spent fuel has reached its destination in the third country within 15 days of the date of arrival and shall indicate the last customs post in the Community through which the shipment passed.
The notification shall be substantiated by a declaration or certification by the consignee stating that the radioactive waste or spent fuel has reached its proper destination and indicating the customs post of entry in the third country.