3.Member States shall require that packages of standard seed and small packages of seeds of the category certified seed be sealed in such a manner that they cannot be opened without damaging the sealing system or without leaving evidence of tampering on the label provided for in Article 28(3) or the package. Except in the case of small packages, they shall also bear a lead or an equivalent sealing device attached by the person responsible for attaching labels. In accordance with the procedure referred to in Article 46(2), it may be established whether a particular sealing system complies with the provisions of this paragraph. In the case of small packages of the category certified seed, packages shall not be sealed on one or more occasions except under official supervision.