The object record that is created when customer returns a product after fulfillment is Return Order. A Return Order is a record that represents a return request for an order or part of an order. A Return Order has a lookup relationship to both Order Summary and Change Order objects, and it contains information such as the return reason, status, date, etc. Verified References:https://help.salesforce.com/s/articleView?id=sf.order_management_return_order.htm &type=5