any idea what these are?

[whatisthis]

New here and not a photographer, my boss wants me to figure out what these are and how much they'd be worth, not sure where else to ask about them.

photo stuff (couldn't directly upload the 6 images here)

In the first 3, the double m industries main part and mamiya part on the back are separate, and it has a Schneider Kreuznach lens

The one in the last 3 photos are unmarked, except for a Nikon lens, and on the (mostly empty) inside part of it is inscribed Copal, a Japanese optics company

 

[tirediron]

Double M Industries is a specialist manufacturer producing/modifying cameras for laboratory, copying and other niche-market work. It's hard to tell what these are given the poor quality of the images, but they appear to be specialized and my guess is that the parts are worth more than the complete units. The RZ 67 Pro II back is a very saleable piece and any MF or LF lens assuming it's in decent shape will fetch at least a few dollars.