What is the purpose of form PS 3533?

Form PS 3533 is primarily used for issuing postal refunds. This form enables customers to formally request a refund for various postal services that may not have met their expectations or have encountered issues, such as undelivered mail or overpayment on postage. When a customer submits this form, the Postal Service can assess their request and initiate the refund process accordingly.

While processing mail claims, tracking packages, and employee time reporting are important functions within the USPS, they are handled by different forms and systems. Therefore, the specific purpose of form PS 3533 is distinctly centered around the processing of refunds, making it the correct answer.