The raised area comes from the sticker of the skull. The original piece of ROTJ armor with a sticker applied was molded from the outside by the production.So the original ROTJ shoulders were raised in the center?
I dont believe it was intended for sticker placement like the auction description says. The original ROTJ shoulders did not have this raised area under the sticker as far as I know.
It is cool to see in these shoulders as it will provide accurate sizing and placement for replica skull stickers.