Hi Richard:
You've hit on one of the fundamental questions of this crazy hobby. I have a very early Cab 11 tractor thats a mess but its worth keeping as it has a mix of Ford and Chev axles which was the norm for these early models.
I'd love to restore it but need much more in the way of parts so recovering what you've found would be, to me, worth while. I'm not try to cut your grass here as the rule I've always followed is finders-keepers until the finder states otherwise, so don't worry that I'm on my way to your neck of the woods with my patented CMP locating device stuck to my windshield!
Personally, I'm at the age and financial comfort level that I'm not dragging every wreck I find from the woods like I used to AND I have enough projects to keep me alive to age 374 years! The only things that will get my attnetion nowadays are guns (artillery peices) and artillery tractors so I would go the extra mile to recover what you found.
The questions you have to ask yourself is what do you want to collect? What level of rebuild is within your grasp (time, money, effort)? Most importantly, what will your other half tolerate?
Based on the photos you attached I would say your in for an interesting and challenging recovery. As for the cab back of the one with the FAT3 data plates I gues anything is possible... perhaps the parts migrated to another 60 cwt chassis, perhaps the previous owner grafted another cab onto the FAT3 chassis or robbed a cab back off another CMP. More research will help answer the questions.
Mike
