Please point me/us to where this is documented.
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Actually, I found it for you (contradicting information):
https://store.apple.com/Catalog/US/Images/apple_certified.html
Each Apple Certified Refurbished Product:
is fully tested (including full burn-in testing).
is refurbished with replacement parts for any defective modules identified in testing.
is put through a thorough cleaning process and inspection.
is repackaged (including appropriate manuals, cables, new boxes, etc.).
includes the operating software originally shipped with the unit and the custom software offered with that system. See each products "Learn More" for more details.
is given a new refurbished part number and serial number.
is placed into a Final QA inspection prior to being added to sellable refurbished stock.
There's *no* mention of replacing batteries, shells, displays, etc.
This has been asked many, many times in the past. You will not find an official, printed confirmation from Apple on this. You can, however, call Apple and their reps will tell you what we've said here, that all white box replacements receive a new screen, body and battery. Many long-time forum members can attest to this since the original iPhone and until we find evidence indicating otherwise, we're going by what Apple reps have been telling us unofficially.
The source that you cited doesn't apply because 1) it's a blanket statement of Apple refurbs in general and omission of specific details regarding a particular product doesn't mean it's not true and 2) Apple does not sell Certified Refurbished iPhones through the official channels. White box replacements can be obtained only via warranty/OOW purposes.