COnfirmation from China Embassy that I can use the 72 hour free transit

Hi, you have already confirmed that my boss is fine to travel on the 72 hour free transit visa, so this is excellent. He is from Belgium and will travel from Paris to China and then to Tokyo, but is there any way that i can get a written confirmation from the Chinese embassy that it will be okay for my boss to use the 72 hour free transit. I am very concerend that he will turn up at thhe airport and the ground staff in Paris will not let him travel. I called air france yesterday and they said they dont know anything about this. I then even called China Embassy but they said i must call Air France as they dont know either....It would be reassuring to get confiramtion that my boss is able to board the air france flight without a visa. Thanks so much