Interior question (pics)

I have a 67 Plymouth Barracuda Fastback and was wondering what suppose to be on the rear deck panel that lets up and down. Right now it is a piece of plywood and I'm not sure if that is correct but it does a good job separating the back section from the trunk. Is the plywood suppose to be wrap in carpet or something else? Also I'm thinking that carpet goes down on the floor of the back section and it just had been removed and threw away. The reason I'm asking is because I've never seen the interior of another fastback and want to get it looking like ma Mopar had it.

Cuda boot area 069.jpg

Cuda boot area 070.jpg

Cuda boot area 071.jpg