Iphone 5s REPLACE Rear Housing Battery

I replace rear housing from my iphone 5s and I dont put back one part (small metal piece of plate). Someone know where exacly this come from???

Probably is somewere from the top of phone. (back camera, top of matherboard, or WiFi connector) but thats it what I know

 

--- Post Merged, May 24, 2016 ---

Thanks got556. I found like you say in website iFixit step 32