Check this out: “The Anunnaki manipulate you and force their minions to apply tactics that only broaden these various fabricated perceptions.”(Sirian Council 072611)
“The Anunnaki have recently left. Their minions, however, refuse to abide by the decisions of the Anunnaki to rejoin the forces of Light.”(Sirian Council 080211 )
From here we can conclude that Annunaki decided to rejoin the forces of Light and have left between July 26 and Aug 8.
Here in an interview between Cori and Webre we learn that there were about 2000 of them stationed on Earth and now we can hypothesize that these 2000 have left. It would be nice to verify these hypotheses, suppositions, guesses from independent sources.