That's too small to be any part of the suspension. Even an end link bushing is larger and looks different.

I've been all over these cars, had a few "try and stump me threads" with guys putting up stuff from other cars/bikes etc and I still do well. Trust me. That's.....not anything to worry about because it's not from your car. Say I'm wrong and it is from the car, it's very insignificant and unneeded or not going to cause any major issues.