I've also just discovered by takin' a closer look at Boba that the unpainted knee is the correct version of him as there's objects sticking out each of his bottom leg pockets so they should never have been painted over in the first place... doh!!
And forgive me if everyone already knows about this but it's new to me!
Subject: Re: ROTJ Palitoy Fett Unpainted knee.. which blaster?