The following guide explains how to enter eBay tracking number if I do not have a tracking number.
If you do not have a tracking number for Ebay you can enter a different valid value that can be used to access delivery information.
Ebay says the following on tracking numbers:
"Note: Different carriers use different terms to mean 'tracking number'. They mean any number which can be used by you and your buyers to track an item."
The value should be unique and can be information that can be given to you to see how the parcel was sent. If a tracking number can not be used you can enter the order id as this can be used by you to find how the parcel was sent.
To setup One Stop Order Processing so that it uses a tracking number if one has been included with the order and if not use the order number put the following macro into the Default tracking No: field on the Shipping options tab (select Options by selecting the Tools->Options menu option).
Now when you import orders, the tracking ID will be set to the macro above, if you send the order to courier and receive a tracking number, the macro will be replaced with the tracking number OR you can also import tracking numbers from a file or manually add them by editing the order.
[%ORDER_ID%] will translate to the eBay transaction ID which will be unique and so satisfy eBay's requirement.