65 Barracuda trunk piece question

I am in the middle of a complete interior restoration on my 65. It has 42,000 original miles, and very very little rust (no floor or trunk pan replacements needed!) but the carpet and seats were a mess. In the trunk I ordered a replacement spare tire cover but there are 2 fiberboard pieces that I am not sure of. I think (?) they go at the back of the trunk and are covered with carpet and screwed to the rear inside trunk panel. But they look like they have been cut, and they might go on the sides of the trunk. I do not want to throw them away but I do want to make new ones if they were original. Can anyone tell me for sure where they go and were they carpeted and original? The carpet pack I got from Legendary has a long piece of carpet that I cannot figure out where it goes and it might just wrap the back inside tail panel.

Thanks