I take it your on about the black sticker over the camera grounding clip and screw in top left corner in the iPhone 4S?
I'm not sure what these do but apple put them there for a reason.
I'm sure they didn't spent millions making these parts just for the fun of it.
It's good practice just to but everything back the way it was then you won't be asking yourself questions if a part isn't working if you left a piece out
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