Chosen Solution

Hi, while replacing screen op Iphone SE (5S) I have a part I dont know where to put. I replaced a completely broken screen so the part comes from eather front facing camera or home button. The part is small from rubber and quite flexible. Many Thanks!! I am waiting to put it back together until I know where it goes.

That goes right next to the front camera. It sits on an ambient light sensor which is where the little bent ribbon part of the front camera assembly is. Right here marked on red: http://prntscr.com/ipnfla Look at the front camera cable and match it up to that place, it sits right over that thing like I said above and mounts right of the front camera plastic mount.