Dear rishiyog,
Greetings from team eBay!
The "Courier Shipping Bill (CSB-V) number is available in your courier shipping bill itself. Check the details available under the heading "CSB Number".
If your query is related to any other topic related to eBay Global Shipping, then please raise a query via the "Resolution Center" on eBay Global Shipping by signing with your eBay ID & password on this link - https://www.ebayglobalshipping.com/
Regards,
eBay INCBT Team