Before the thread gets too hijacked, it is for selling the "Lower-cost movie-sized helmet kit."
Loveless,
The "dimple" is a Borden connector. It's a found part that was on the original props from ESB and ROTJ.
The discussion of mystery helmets is a long discussion. They've been around longer than SW EP I, II, and III. The best way to get up to speed is to use the search function on this board and read all about the RS plug, the Lava Helmet, the Don Post Deluxe, and so, so much more. There are many versions of Boba helmets used in the SW films, pre-production suits, and currently in the exhibits.
I personally haven't heard about a Boba helmet being scanned to make the Jango, but the question would be, which Boba helmet was scanned? Again, there are many versions. I've seen a ROTJ and Jango bucket next to each other in person, and the Jango looks smaller. There are people on this site that own a reproduction of the actual Jango bucket and also own a copy from a plug of an actual Boba bucket, so they'd be the ones to truly say.
The search function can take you to all the threads discussing this subject. For now let's keep this thread for MB's cool lower-cost helmet.
P.S. Ask Brak's Buddy all those questions too, he seems to know everybody and everything about Fett stuff.