I think I'm misunderstanding this whole issue about switching screws out. It's SOP for Apple to just give you a refurbed unit instead of actually fixing your iPhone. A refurbed phone will have the new screws, of course.
Or is someone claiming that they take your phone, switch the screws out, and then somehow fix that very same phone and give you the very same unit back?
No, pretty sure you are one of about 6 people actually understanding.