Who cares if they are issued or not its 200 dollar gun that is reliable and accurate for backwards country fighting. If someone wants unissued stuff then buy Ruger or Colt fresh off the shelf made in 2015. That are made the same way and look the same, feel the same shoot the same.
Each SKS looks, feels and shoots different from the other SKS in the same crate. This is what makes SKS interesting for collecting and shooting. They are like people, same but different.
What else do you want?
Quest for unissued SKS is as absurd as looking for 40 year old virgin.