provided in paragraph (1), is incapable of being delivered, but contains the sender’s address, it shall be returned to such sender. (3) Where a letter or postal article is incapable of being delivered but has a sender’s address on it, it shall be returned to such a sender un opened. (4) Every undeliverable postal article that has been opened and remains undeliverable may be kept for a minimum period of three months and may thereafter be destroyed; Provided that where such a letter or postal article contains any thing of value or a saleable article, it shall be safely kept and a record thereof opened and maintained by any postal licensee for a period of six months and if unclaimed, the contents shall be disposed off in accordance with any written law. (5) Where a letter or postal article is returned to a sender by reason of being undelivered as addressed and that sender refuses to take delivery of the same, the letter or postal article shall be dealt with as provided for in paragraph (4). PART XI – TARIFFS REGULATION Scope. Price cap. 90. (1) Except as provided in regulation 97, this Part shall apply to licensed services which are not open to competition and whose tariffs are subject to regulation by the Commission. 91.(1) All licensees whose tariff rates are subject to review by the Commission pursuant to the price cap condition provided for in respective licences shall file with the Commission applications for the adjustment of such tariff rates. (2) All licences for services that are subject to price cap condation shall contain the period in which such tariffs may be adjusted once a year. (3) The obligation to comply with the terms and conditions of the price cap shall extend from the date on which a licence becomes effective up to the period when the services 65