The Post Office had officially established a branch post office on "Barbero" and delivered some 3,000 pieces of mail to it before "Barbero" left Norfolk, Virginia. The mail consisted entirely of commemorative postal covers addressed to President of the United States Dwight Eisenhower, other government officials, the Postmasters General of all members of the Universal Postal Union, and so on. They contained letters from United States Postmaster General Arthur E. Summerfield. Their postage (four cents domestic, eight cents international) had been cancelled "USS Barbero 8 June 9.30 am 1959" before the boat put to sea. In Mayport, the Regulus was opened and the mail forwarded to the Jacksonville, Florida Post Office for further sorting and routing.