What is the primary purpose of the PS Form 3533?

The primary purpose of PS Form 3533 is to request a refund. This form is specifically designed for customers who need to obtain a refund for postal services, such as unused postage or fees associated with certain transactions. When a customer fills out this form, they provide the necessary details regarding their request, which is then processed by the postal service.

The other options relate to different types of transactions or requests that are not relevant to the purpose of PS Form 3533. Purchasing stamps does not require a refund request, applying for a job involves a different set of procedures and forms, and renting a PO Box is handled through a separate application process. This clarification underlines the distinct role of PS Form 3533 in the context of USPS services.