Hi Steven,
you mentioned the corner markings in the photos.
Commonly in an aerial mapping or surveying camera the fiducials and all the additional information we normally find on the black image frame -such as altimeter, image counter, focallength information, time stamp, vertical gauge, etc are exposed onto the film while the image is taken. So all these things are "fixed" parts within the camerabody.
Having this in mind I was wondering about the corner-markers in your images, which have no constructive connection to the image frame. My conclusion is, that these corner markers may be exposed to the film by some other means, but I think these are no markings like the fiducials from the camera frame as in metric mapping cameras. I assume hat these markers therefore will not be usable for any kind of calibration.
Just some thoughts about it ...
Cheers