eBay doesn't have order numbers officially assigned to orders and ShippingEasy has found that using eBay's Sales Record Numbers works best for ShippingEasy customers.
When searching for an order within ShippingEasy, this is the number you will want to use as it is what ShippingEasy pulls in. There are a few types of records numbers used that vary depending on the type of sale: auction item vs. Buy It Now.
To locate your record numbers within eBay, navigate to the Selling Manager page within eBay. On the Selling Manager page, there will be a column entitled "Record Number".
NOTE: It is possible for this column to be hidden as eBay allows each seller to customize their Selling Manager page's view. Find more info on how to customize your view.
How to use ShippingEasy with eBay
Can I combine multiple eBay stores into one integration?
What order status values are brought in from eBay?
Why don't my eBay order number's match?
How is my eBay order number generated?