Does anyone know what this clip is called please??

I have a 2012 Audi A1 2.0 diesel and the rear bumper has slipped a tiny bit I've noticed when I open the boot that this clip (or whatever it's called) is missing. Can someone tell me what it's called please so I can get a new one? Also one of the hole plug things 😂 is missing too if anyone can help I'd really appreciate it.

Thanks

Pic is not my car just using for reference.