Thank you for the information on the missing part that turned out to not be missing after all. I'll chalk it up to my lack of familiarity with this design. I must have seen the hole formerly plugged by the op rod handle and assumed there was a missing screw.
Thank you also for the quick response on what is (or rather isn't) in the log. I can only wonder what parts or originally had, although here are the numbers I could find on the parts currently on it:
Barrel-2076G
Magazine housing-B4737
Trigger assembly-A1439
Extractor-H0749
Firing pin-3812
Bolt-A5394
Locking can-B7099
Do the barrel or extractor numbers seem out of place given their G and H block on a no-letter block rifle, or is that pretty common throughout production?
As far as the lack of destination in the logs, could any of them have been sales/demonstration pieces for potential buyers? I had documented salesman's Reising Model 60 a while back that I sometimes regret selling. I guess we will probably never know.