Then you read it wrong. You can have a pristine 1969 Mustang Mach 1 and it certainly won't be "all original". Pristine refers to the overall condition of the rifle, not anything to do with originality.
If nothing else, many Mausers went through rebuilds during the war. And after the war the Bolsheviks did all kinds of things to them. Also you are only ONE PERSON among how many collectors/shooters? You can only relay your own personal experiences.