I have a canon 100D/SL1. I was swapping my lens today and when removed the lens I noticed something fell, turns out it's the focusing screen. However I powered on the camera and took some pictures and it seems to be working fine, maybe a little bit overexposed but nothing terrible.
Do I still need to replace my focusing screen? And if so, what are my options? Found the screen itself on eBay for cheap but couldn't find anyone that comes with the metal housing.
Edit: Added picture