Question Mystery piece. Please help identify.

May 17, 2020
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Hi,
This mystery part fell loose while removing my back cover on a Toshiba Satellite S855. Can you help me to identify it? It was near the wi-fi adapter.

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I was removing the cover to replace the top panel which contains the touchpad/wristrest. I proceeded to move all the components into my top panel without this mystery part. Now my laptop won't boot. No beep, no display, no messages. The only thing that turns on is the fan and the led lights indicating power.
I am not sure if I this piece is the culprit of if I damaged my motherboard while moving it. Any help in identifying this part or any other clues to help me w/next steps in troubleshooting is appreciated.
Thanks.
 

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