I found a close up picture to explain what I was trying to earlier. Where you are seeing a Z-71 sticker, is just too close to the top of the bed, and too far back for me to agree that there might be one there, unless, just maybe they added an after market decal to the truck on their own. But that still does not sit right with me, because of the lower suspension.
This is a picture of a Z-71 bed with a sticker. (wrong side of the truck, I know) Hopefully you will see where I am coming from. The area that you have enlarged,in your diagram, is where the body of the truck bed, starts to bow out around the wheel well. Not an ideal place for a sticker, IMO. I have highlighted the bowed out area for the wheel well in blue for you. Sorry if I can't explain it correctly, we might have to agree to disagree.. LOL