Which form is used when a customer requests a replacement money order?

The correct form to use when a customer requests a replacement money order is PS Form 6401. This specific form is designed for customers to initiate the replacement process for lost, stolen, or damaged money orders. It captures the necessary information required by the USPS to process the replacement effectively, such as the details of the original money order and the customer's contact information.

Additionally, using the correct form is crucial because it clarifies the request and ensures that all necessary details are collected upfront, facilitating a smoother transaction. The other forms listed do not pertain to this specific purpose: PS Form 1002 typically deals with applications for post office box service, PS Form 1234 is used for certain postal operations unrelated to money orders, and PS Form 2001 is related to other types of postal service applications. Therefore, PS Form 6401 is the appropriate choice for a replacement money order request.