Just to be clear: at first they wanted to do 6 Supertrooper suits, but only one was fully made and by the time it was presented to Lucas and Co. the concept was already changed to Boba Fett; in the light of this change, the rest of the 5 suits can be called Boba Fett prototypes and no longer as Supertroopers.
Regarding the dented prototypes, there are 2 helmets that can be traced their later counterparts, This helmet became the Pre-Pro #2:
[ATTACH=full]219179[/ATTACH]
And this became the ESB Promo #1 and later as ROTJ:
[ATTACH=full]219180[/ATTACH]
[ATTACH=full]219181[/ATTACH]
There are to chipped in areas in the right mandible and the bottom of the rear keyhole and a small gap between the lower front part of the left ear and platform.