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Publication 52 - Hazardous, Restricted, and Perishable Mail >
4 Restricted Matter > 46 Motor Vehicle Master Keys and LocksmithingDevices > 463 Packaging and Marking
No marking of any kind that indicates the nature of the contents may be placed on the outer wrapper or packaging of any mailpiece containing motor vehicle master keys or locksmithing devices. Mailable matter must be properly and securely packaged within the general requirements in DMM 601.1–8.