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Internal - what are the two elements on the corners of the MBP?

I opened up my MBPr Late 2013 and saw that on both sides, near the fold (where the display folds) there are two similar looking elements. Please see attached image. One of the was loose and after placing it back in its place I no longer have any "no hardware found: wifi" issues.

I know the airport card is next to the ram, so it can't be that. Therefore I wonder what those things are and if they are related to the fix of my wifi problem? Or if it is just sheer coincidence?

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Those are rubber hinge covers on the 15" machine. See steps 9 & 10 of this guide: MacBook Pro 15" Retina Display Late 2013 Display Assembly Replacement

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So they have nothing to do with my wifi being fixed? I wasn't able to fix the "Wifi: no hardware found" with software solutions (shift+ctrl+option+power 5 seconds). Only after opening up my MBPr and placing that rubber thing back in its place, suddenly my wifi worked again..

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See step #5 of this guide and press on the connectors: MacBook Pro 15" Retina Display Late 2013 AirPort Board Replacement

You may also have been placing pressure on the cables that run through that hinge with the screw cover.

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