I might be able to assist.
To ship with FedEx you have to register with FedEx as a hazmat shipper.
When you register you will have to provide them with your hazmat shipper certificate.
I was hazmat trained by SafetyRegulations.com so I was able to give FedEx a copy of the certificate Safety Regulation Strategies, Inc. mailed to me.
Here is the link to FedEx:
When you finally ship with FedEx, make sure you fill out the paperwork properly and label the airbag box properly.
Hope that helps!