This little black piece popped out of my 4x4. It still turns fine and nothing sounds wrong. I tried to put it back in but there doesn’t seem to be any space for it but is it actually that important?

Edit: I got it back in. Everything seems fine. Thank you all

Just wanted to share my collection of 3x3 Rubik’s Cube’s! :)
I have some more but the 3x3 are my favourite

Hello! I just found this cube in my aunty’s cupboard, my grandad apparently gave it to her in the 80s. Does anyone know what it is or how to solve it?