...And you won't hear it being mentioned anywhere, either. It's not public information.
That would make Apple a public liar, which is unlikely over something like this.
Phil Schiller himself bragged about the Stainless Steel logo on the iPhone 6 and 6 Plus during their intro:
"I am honored to represent the whole team and be the one to tell you about these incredible new iPhones. Their design is like nothing ever before. Incredibly unique, from the glass front, the curves around the side to meet seamlessly with the anodized aluminum back, complete with stainless steel Apple (logo), it is truly the most beautiful phone you have ever seen."
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