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Mailing Standards of the United States Postal Service,
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5 Nonpostal Export Regulations > 550 Dried Whole Eggs
When dried whole eggs purchased under a program of the Commodity Credit Corporation, U.S. Department of Agriculture, are offered for export by mail, an endorsement must be written or stamped on each package and a special certificate of mailing (see 552) prepared and completed by the sender waiving any right to withdraw the package from the mail or to have it returned. Such mailings can be made only by Priority Mail International.