WTF do I do with the copper shield sticker?? I figured it out guys.
Il Mio Problema
Reparing an iPhone 5s screen, I accidentally broke the copper shield sticker.
La Mia Riparazione
The info isn't on the web. iFixIt will send you the part, but your on your own. Thankfully I ordered a spare front facing camera on the off chance I broke that too, because I really didn't want to tell the person who owns the phone I need yet another day to fix it. Anyways, that meant I could dissect the old one. I realized how the shield sticker goes into place (none of the guides cover this) and successfully replaced it.
Il Mio Consiglio
The shield sticker sticks right on to the back of the camera. Then it folds over the other cables, and from there you can stick it on the backplate. Not obvious, and omitted from the guides. I feel for the poor soles that I see in the comments of the replacement guide who were annoyed, confused, and disheartened.
iPhone 5s/SE Front Camera and Sensor Cable
iPhone 5s/SE Camera and Sensor Cable Copper Shield Sticker