I would just send the EBM myself. How do you have it stored?

I used to have mine in icecubes, so I could make up a bottle with the cubes still frozen, leave it in the fridge overnight to defrost and then send it to CC ready to go. They just popped it in their fridge and warmed it up when needed.

Personally, I think if you can defrost it yourself you should. Then you know it has been done properly.