Yes, I've seen birthers claim this. Unfortunately, the claim is just not true.
I’ve given source after source after source saying that a denial of access to a record is confirmation that the record exists. I think on obamaconspiracy.com I gave over 15 different documents which all agreed on that.
At obamaconspiracy.com the entire group came up with a total of zero documents saying otherwise.
So cite your sources. Let’s get to the meat of this claim. YOu can’t just say the claim is true and expect any reasonable person to believe you unless you’ve got sources that trump the 15+ that I’ve given to document the claim.