Hi guys! I have a c 300 2015 4matic. Recently i hear this rattling jiggling sound from the back of my car.when im driving inside i barely hear it however outside pretty loud. It happens when i get in potholes and my car is shaked up a bit. It sounds for me some light plastic aluminum part because it doesn have heavy knocking or somethin like that. I went under the car and i found a plastic part what covers the zhe car shocks. I head more on the left than on right and the part is really loose on ghe left on the right a bit. It may be this but i cant believe this plastic part can make this such a noise.

short videos:
https://youtube.com/shorts/hvKKqPp73K4?feature=share