Not strictly 2A related but more serious than general political.
Judge Napolitano gives a speech where he mentions these self written warrants. I have not heard of them. Apparently they are part of the Patriot Act. FBI tried to imprison 2 elderly librarians because one showed the warrant to the other, in violation of the law.
See the video:
YouTube - Judge Andrew Napolitano Natural rights Patriot Act - Part 3 of 3