I believe that also about allot of dogs.
Have personally many of dogs papers get changed as they go thru hands over the years.
Folks post pics of dogs & pups that look nothing like the dogs I've seen & when look @ peds can catch sometimes the one that got changed.
The only way to have the right papers is to breed your own dogs.
You can never guarantee what others did before you but you can what you put your name on.
You only know what you see.