What is this part and where can I get a replacement?

Hi, I was removing the power button because I needed to reshape the corner so the button wasn't getting stuck. All went well but when I was lifting the top mental cover this little flat cable came detached so and was fiddly to get back on so i removed it thinking I'll attach the other side first and the connector got stuck on the board.

I am desperate to find a replacement but have searched the web and cant find 1. I have attached images of the cable and it where it came from. It was attached under the metal bit. You see the 2 screws on the right it was attached on the bottom side of that.

Please help! :)

Thanks