That's just it. He's not asking for a certified copy to examine. He is only asking for official notice that they have one and that it is legit.
I thought I read somewhere that they (Sheriff Joe’s group) have a signed affidavit by someone who was an employee of the department responsible for vital records in HI stating that he was told there is NO birth certificate. He was getting a lot of interest/requests and when he asked officials about it, he was told they did not have one. Wish I could remember where I read about this.