See above, I missed your pictures. VERY seldom is info found to point to a unit, it would need to be unit marked (obvious if done on the front gripstrap usually), or you knew who captured it and from whom, so no, almost no way to find out.
NOTE:
Although a "giveaway" having either the east german or the russian capture grips, I always check each gun out, as they are only grips
and could be swapped out by someone who "liked" the grips. A pair of krieghoff grips donna make a krieghoff
Ed