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:

Case 1: No Refurbishment
Model: iPhone X
IMEI Number: ###############
Refurbished: NO
[This doesn't necessarily mean it's not a refurbished unit.]

Case 2: Refurbished
Model: iPhone 6
IMEI Number: ###############
Refurbished: YES