Original helmet cast.
Master lightly sanded to remove paint. Cracks (most of which are from AFTER the filming of ESB) removed/filled.
Molding master pulled and brought to SDCC.
It is my understanding from that from here, the molding master will be sent to China where they will make a ton of molds from it and start pumping out the final helmets.
You asked if the mold eFX made of the original helmet would be shipped to China. Never. First, they wouldn't know what to do with it. Second, they couldn't make a finished helmet from it... and you don't want a minimum wage Chinese worker who has never heard of Boba Fett trying to determine the details of your Fett helmet. Third, the chances of the mold being returned intact would be slim to none. Also, you have to realize that mold was made solely for the purpose of pulling a master and nothing more. It wouldn't hold up under the strain of having pull after pull taken from it and it would slowly deteriorate. There were an incredibly small amount of pulls taken from it and only so a production mold master could be created.