Boba's armor is Jango's silver armor repainted. In the kiddie book series about Boba we see him in book 1 The Fight to Survive take Jango's helmet and put it on. He wears it a lot after that. In book 5 A New Threat one of Jabba's servants who's friendly towards Boba resizes Jango's armor for him (as he's about 12 or 13 here) and Boba starts wearing that. In book 6 Pursuit he decides to make the armor his and repaints it.
And as for where Jango got his silver armor, in Open Seasons Part 3 we see that a faction of the Mandalorians betray the other and Jedi, yes, Jedi, are tricked into thinking this planet they're on is under attack by the peaceful group of Mandos who think they're there to rescue some government people trapped on a mountain, so the Jedi kill all the Mandalorians except Jango whom they sold into slavery cause we all know that Jedi are kind and caring. (I don't much care for PT Jedi, they were kinda corrupt by that point) After Jango frees himself he goes back to kill some of the people responsible for his slavery and the slaughter of the Mandos. The guy in charge of the planet who sent for the Jedi is one of them, and he happens to have a mini-museum and part of it is some silver Mandalorian armor. And Jango takes these.
Where the armor was before that, I don't know.
I do know Boba has spares and extras, so by the time of ANH he might not even be wearing the exact same armor, at least not entirely. And we know he does change bits from movie to movie, such as gloves and flightsuit, for example. Also in ANH his shoulder pad is missing the mythosaur (sp?) skull, but in the other two he has it there. And in one of The Bounty Hunter Wars books the visor of his helmet gets a crack in it and he goes to the closet to get a new one. So I gather he sorta collects Mandalorian armor, if for no other reason than spare parts.
I wouldn't base anything entirely on a collectable, even if it is Master Replicas.
As for dents, he can bang those back out. Jango even tells him this in The Fight to Survive I think it was, that you get out the dents, fix it up, clean it, but never polish it. And where Boba's dent came from is Enemy of the Empire, I forget exactly what happens but I believe it's from being shot.
Reality doesn't care if you believe in it.
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