When rifles were surrendered in both world wars, bolts were taken out and thrown in a separate pile. Obviously no one took the time to sort out the matching bolts and install them back in the rifles so a good percentage of rifles will have mismatch bolts at the very least. Most matching rifles were brought back as trophies by soldiers who picked them up on the battlefields or traded into them with other soldiers or Marines who did. The same holds true for Japaneserifles with the "Mums" still intact and not ground. Those were usually picked up by individual soldiers, not plucked out of a huge pile of surrendered weapons.
---------- Post added at 01:35 PM ---------- Previous post was at 01:33 PM ----------
I imported a load of Turkishissued Ross and GEW98 rifles back in the early 2000's. They were mismatched but sound and not very pretty. I took a load to the AGCA show in Alabama and much to my surprise, didn't carry one of them home. Folks were hungry for them regardless because they are just plain hard to find in this part of the world.