The same thing happened to me, and didnt notice the hinge or lack their of either UNTIL I GOT IT INSTALLED!
The Porsche Dealer didnt know anything about it but send me a part that was suppose to be a replacement part.....
So, not wanting to remove the console and put the crappy one back in I made my own...Similar to what is being pictures. not bad looking at all.
But it sure didnt sit right with me, having been sold a part like that.