For anonymous mail over 13 oz, what must the SSA apply on the package?

For anonymous mail that weighs over 13 ounces, it is required to apply an AVSEC Clearance Stamp on the package. The AVSEC Clearance Stamp indicates that the appropriate security screening has been performed, which is especially important for mail that exceeds this weight limit. This requirement is rooted in postal regulations that seek to ensure the safety and security of the mail as it is handled and transported through the postal system.

This stamp signifies that the package has been properly vetted for any potential security risks, which is crucial for heavier items due to their increased scrutiny during the shipping process. Other options, such as a return to sender sticker or customs declaration, serve different purposes. The return to sender sticker is used primarily for undeliverable mail, while the customs declaration is necessary for international shipments to outline the contents being sent to another country. An insurance label is used to indicate that a package is insured, which does not specifically apply to ensuring security clearance. Thus, applying the AVSEC Clearance Stamp is the correct process for handling anonymous mail over 13 ounces.