When orders are placed in Volusion, customers can select their preferred shipping method. Volusion applies a code to each order, and the code is displayed on the READY TO SHIP page when you hover above the link View Customer Shipping Selection.
You can look up the code, depending on the carrier options on your store, using the links below.
NOTE: if you are unable to find the code applied to the order, it is likely that your customer did not fill out the full shipping information including the carrier selection, carrier service, and packaging. Therefore, Volusion will not have a corresponding service code.
How to: Remove Volusion orders from ShippingEasy
Troubleshoot: Syncing Volusion orders