Frank's License was issued by one of former MRSF staff in July 2006, which was illegal. The stamp on it was already invalidated by the Mongolian Police in 2005. To those visiting Mongolia, it is your responsibility to make sure you have valid documents for the country you visit, correct? Unfortunately, Frank didn't contact MRSF and validate his License.
I have the Letter of Mongolian Police about invalidated the stamp with registration number УХ31043 which is in Frank's License. If any one wants to see it please e-mail me.

Bat, JT1CS