Not sure who you are alluding to but all steel we buy come with mill certs..... thats how it is done.
Maybe you should get a clue before posting your nonsense.
The steel they buy to make the rebar will be supplied with batch mill certs.
Were those certs bogus ?
Xin Ke Yuan Steel should have independent testing done.. not at the Thai institute... there is several in Thailand that can do this.