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Dear Mr. Kurdylo,
Thank you for posting your question to History Hub. The National Archives facility in Washington, D.C. has a series of Records Relating to Mail Service during World War I that would probably be your best bet. The series description mentions records related to the Espionage Act of 1917, but it may include records related to the Trading with the Enemy Act as well. The reference staff in D.C. can be reached at email@example.com.
Best of luck with your research.