Mailed packages
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
(a) If you import a restricted article through the mail or through commercial express delivery, you must mark all sides of the outside of that package with the contents of the shipment and the name of the exporting region. The marking must be clearly visible using black letters at least 1 inch in height on a white background.
(b) If you import a restricted article through commercial express delivery, you must provide an accurate description of the complete contents of the shipment for the shipment's delivery manifest entry.
(c) In addition to the export certificate required in § 322.30 (if applicable), a restricted article that is imported by mail or commercial express delivery must be accompanied by an invoice or packing list accurately indicating the complete contents of the shipment.
(Approved by the Office of Management and Budget under control number 0579-0207)
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.