flyblue
I originally thought the two jumpseats were attached to an aft bulkhead (structural or otherwise) because of the seeming reduced radius apparent at the perimeter of the curved joint with Fuselage inner skin. If the structure's termination in a straight line adjacent the 'inner' seat is a 'passageway', it suggests a narrow (overall) width. The Fuselage forward does not reduce its diameter until forward of where the jumps would be.
Also, in observing the belts, it is possible they were 'adjusted' by recovery personnel, although one is doubtful that pros would in any way alter the appearance or the ability of evidence to tell a story when closely examined. I think they were well aft and near the pressure vessel's aft terminus.