What form is used to inquire about a lost or stolen money order?

The inquiry about a lost or stolen money order is done using PS Form 6401. This form is specifically designed for customers to report such incidents, ensuring the inquiry process is systematically handled by the USPS. By using this form, customers can provide all necessary details regarding the money order, such as the date of purchase, the amount, and other relevant information that can assist in tracking and resolving the issue.

Other forms listed have different purposes. PS Form 1412 is typically associated with the submission of a money order for cashing. PS Form 3212 is used for various postal services and not specifically for money orders. PS Form 1000 is related to the registration of items, which does not pertain to lost or stolen money orders. Thus, PS Form 6401 is clearly the appropriate choice for this particular situation.