Help Identify original or refurbished Xperia Z3

Hello guys,
Someone offered me a new Xperia Z3, in fact i don't trust him that much.
My question is, is there is a way to identify the original phone?
In other brands there is some code called reconditioned "RTN" that identify if phone was refurbished or repaired before, is there any similar code that
works for Xperia Series ?

Thanks