Consultant to consumer electronics manufacturers.
I don't know what's going on here. First, it seems like this instruction is in the wrong place -- it should be a few steps later. Second, the phone I was working on did NOT have the piece described. I don't know if that means that the phone was screwed up before I got it apart, or whether there was some change to the design to the iPhone that some models have this piece separate, and some models don't. As far as I can tell, the proximity sensor works after reassembly.
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