Flying fairphone2 and extra part after rebuilding it

This evening, my FP2 tried to fly in the staircase and literally burst into pieces. The slim case did its job and the phone still works and the screen is ok. But after rebuilding everything, I have a small rubber/plastic part that I’m not able to guess its correct location:

Everything looks ok (except for the case that has a few cracks now), but I would like to put this piece of plastic back to its correct location… Any idea ?

Without much further ado:

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Wow, that was quick and very helpful ! Thanks !