What action should be taken for anonymous mail articles weighing 13 oz or more?

For anonymous mail articles that weigh 13 oz or more, the appropriate action is to apply an AVSEC Clearance Stamp. This procedure is part of the security protocols established by the USPS to ensure safety and compliance with regulations concerning mail handling.

The AVSEC Clearance Stamp indicates that the package has been properly screened for security purposes, which is especially critical for anonymous mail due to the potential risk factors associated with unidentified senders. The emphasis on security measures aligns with the USPS's commitment to maintaining the safety and integrity of mail service.

Applying the AVSEC Clearance Stamp helps in further processing the mail correctly under the established guidelines. Given the weight of the mail (13 oz or more), additional scrutiny is necessary, hence the requirement for the stamp to ensure proper handling and security checks have been conducted before it is allowed to enter the mailstream.