How to return Amazon a returned item from MWS

I'm trying to get the returned items for each order, but unfortunately it doesn't seem to provide such information from Amazon Web Services.

            public GetOrderResponse InvokeGetOrder()
            {
                // Create a request.
                GetOrderRequest request = new GetOrderRequest();

                request.SellerId = sellerId;
                string mwsAuthToken = "";
                request.MWSAuthToken = mwsAuthToken;
                List<string> amazonOrderId = new List<string>();
                amazonOrderId.Add("106-5297482-5403402");
                request.AmazonOrderId = amazonOrderId;
                return this.client.GetOrder(request);
            }

      

        
        
        
      

    

The code above is for getting order information for a specific Amazon order ID.

Here is the result

<GetOrderResponse xmlns="https://mws.amazonservices.com/Orders/2013-09-01">
    <GetOrderResult>
        <Orders>
            <Order>
                <AmazonOrderId>asdfasdf</AmazonOrderId>
                <SellerOrderId>asdfasdfas</SellerOrderId>
                <PurchaseDate>07/17/2014 10:39:34</PurchaseDate>
                <LastUpdateDate>07/17/2014 22:17:37</LastUpdateDate>
                <OrderStatus>Shipped</OrderStatus>
                <FulfillmentChannel>AFN</FulfillmentChannel>
                <SalesChannel>Amazon.com</SalesChannel>
                <ShipServiceLevel>SecondDay</ShipServiceLevel>
                <ShippingAddress>

                </ShippingAddress>
                <OrderTotal>
                    <CurrencyCode>USD</CurrencyCode>
                    <Amount>53.18</Amount>
                </OrderTotal>
                <NumberOfItemsShipped>2</NumberOfItemsShipped>
                <NumberOfItemsUnshipped>0</NumberOfItemsUnshipped>
                <PaymentExecutionDetail />
                <PaymentMethod>Other</PaymentMethod>
                <MarketplaceId></MarketplaceId>
                <BuyerEmail></BuyerEmail>
                <BuyerName></BuyerName>
                <ShipmentServiceLevelCategory>SecondDay</ShipmentServiceLevelCategory>
                <OrderType>StandardOrder</OrderType>
                <EarliestShipDate>07/17/2014 18:50:15</EarliestShipDate>
                <LatestShipDate>07/17/2014 18:50:15</LatestShipDate>
            </Order>
        </Orders>
    </GetOrderResult>
    <ResponseMetadata>
        <RequestId>asdfsadfasdfasdf</RequestId>
    </ResponseMetadata>
</GetOrderResponse>

      

        
        
        
      

    

I know this order contains the returned item.

Many thanks.