What is the purpose of form 3813?

The purpose of Form 3813 is to secure items valued at $200 or less. This form, known as the "U.S. Postal Service - Request for Special Services," is specifically designed to provide a method for customers to request additional security for parcels and mailings that fall under this value threshold. By using Form 3813, senders can ensure that their items are protected during transit, which is particularly important for valuable or sensitive goods.

In this context, it is important to note that while other options might refer to services or needs related to postal products, they do not align with the specific function of Form 3813. For example, the notion of insured mail security for items over $200 pertains to different forms and services dedicated to higher-value items, while expedited delivery services and tracking packages at no extra charge are distinct services rendered by the postal system that do not relate to this particular form. Therefore, emphasizing the security aspect for items valued at $200 or less makes this option clearly the correct one.