The rear carpet panel pulls off away from the bootlid. It's held in with metal clips.
The Boot decor panel can be held in with two bolts hidden under the numberplate. After that you need to pull down the panel then it should lift away from the bottom. If you pull it backwards away from the bootlid you'll break the plastic clips that hold it in place, and you will end up with a flappy decor panel, of which you can't get new clips for. Someone on here did a drawing that explains it a little better.