1 - It's possible the dial was not centered right in the first place, but the dial moving out of position in the case can only happen one way in my experience - an impact such as dropping or knocking the watch quite hard.
2 - They can be scratched while being handled on installation.
3 - The amplitude is referring to the amount the balance swings in each direction, and low amplitude is a sign of a movement that requires servicing. It can also result from the dial shifting, and binding on one of the posts that a hand is attached to.
I think you have to take these "findings" with a grain of salt, because virtually every estimate I've ever seen has similar things on it (case has signs of wear, scratched/marked hands, bracelet has signs of wear, etc.). The reality is on a new watch they will likely replace all the hands anyway, so that one is really moot.
Cheers, Al
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