The problem is that no one has proven the document is fraudulent IN A COURT OF LAW. Until that happens, “fraudulent document” remains an accusation.
No state or local prosecutor in the nation seems interested in taking up this issue and pursuing it to a grand jury investigation. No one should expect federal law enforcement/prosecutors who are under the control of the Obama administration to have any interest.
The fact that there has been no "day in court" because of a corrupt judiciary and congress, can and does not erase the fact of wrong doing.
All it reveals is that the courts and legislature are not doing their Job.