Don't apologise - there is a lot of misleading, ambiguous, or just plain wrong information out there on these rifles - in books as well as on the internet - it can be hard trying to filter out the BS, and to get info from confirmed sources.
The records will be hidden in some archives somewhere - probably next to the Amber Room - and will no doubt never be available to us Western arms collectors. It surprises me that a Russianarms student hasn't got access (maybe even they aren't allowed?) to the records so some of the dodgy information out there can be cleared up. I think that all too often we look to Western books for accurate info, when perhaps we should be looking further afield.