He got the dent when he fought kenobi in kamino. Or I think from the slave 1 bay door hitting him in the noggin?
Same stills I have also. But yeah CGI magik. Lol. It's hard to nail down exactly when in the Kamino battle that he gets the dent, and part of that is the fault of the CG animators. I grabbed some quick screen shots...
First, the money shot of Jango that was in the first trailer. Right at the beginning of the battle he turns to see Obi-Wan coming. **Human/no dent**
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Then, right after that is the CG model of Jango about to take flight. Here, he does have the dent **CG model/dent**
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Next is when he fires the rocket from his pack, and the dent is still there...(notice the range finder aimed at his back too) **CG model/dent**
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Yet, after he crash lands and loses his pistol he does not have the dent. (blurry pic, hard to get a clean shot of this as it is literally only a second or two long) **human/no dent**
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But after he gets kicked by Obi-Wan and headbutts Obi-Wan the dent is present. It's also after he crashes to the ground losing the jetpack, but I can't get a clear shot of his helmet in between those two scenes. **human/dent**
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So, it's in there that the costumers switched to the dented one.
Interesting, I see it from when he's up on the column onwards, before he even fights Kenobi up close. Only not there during initial engagement and maybe in the CGI flying for the cable grab on Obi's hands. Definitely even on the real costume when he's sliding down the roof.So rewatching the Kamino fight, I think the intent for the dent is from when he headbutts Kenobi. Its present on the actor and cgi in all scenes after that moment, albeit a bit hard to make out in the rain unless you slow it way down.
its definitely visible when hes up on the column too, but I think this is just a goof on the part of the cgi team using the same model for everything hoping nobody would notice lol