I thought they dumped the lenses and bodies on the lunar surface and only returned with the film backs. This to save weight for much more valuable moon rocks. I suppose the back could have jammed on the body making return with the whole unit necessary.
Ditto this. Though maybe this order changed on later missions? Anyone have a lead on this?
I wonder who the seller was. Those are not supposed to be in the hands of the public. I believe any that are, are considered stolen.