I found a little plastic piece loose inside a new PC

**I found a little plastic piece inside a new PC, and I am not sure what it is. It was loose inside the case. There is no number or letter on the piece. I cannot contact the seller for some days and I was wondering if is it safe to turn on the PC. What can it be?**

Find here some photos. USB for scale.

[https://postimg.cc/crBYDP50](https://postimg.cc/crBYDP50)

[https://postimg.cc/zVrKFq7x](https://postimg.cc/zVrKFq7x)

[https://postimg.cc/0Kgm3vs2](https://postimg.cc/0Kgm3vs2)

Thank you!

EDIT: It was solved! It was a piece from the PCI slot. Thank you all!!!!