We encourage you to check Manage Orders in your seller account regularly to ensure you are aware of all incoming orders. Do not rely on the "Sold, Ship Now" email notification alone to identify shippable orders. You also can check for shippable orders using the Unshipped Orders report.
You should only ship orders that you can verify in Manage Orders. All orders listed as "Unshipped" in your seller account can and should be shipped promptly in accordance with Amazon policies.