Checks whether a device has been serviced / refurbished by Apple since purchase.
Important: It is not related to the MPN (i.e. when a refurbished unit is sold by Apple).
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Sample:
Model: iPhone XS Max
IMEI Number: 3592xxxxxxxxxx
Refurbished: NO
NOTE: THIS DOESN'T NECESSARILY MEAN IT'S NOT A REFURBISHED UNIT.
Model: iPhone 6
IMEI Number: 3520xxxxxxxxxx
Refurbished: YES