Postal Packets (Customs Examination) Sir W. Darling asked the Postmaster-General under what authority ordinary corespondence addressed to the United States of America is opened by the General Post Office in Glasgow; and what is the significance of label O.E. 22. Mr. Wilfred Paling The authority is the Foreign Postal Packets (Customs) Warrant, 1948—Statutory Instrument 1948 No. 562. Label O.E. 22 is used for sealing packets which have been opened for examination by the Customs.