Almost nothing has been confirmed if you are speaking of testimony under oath or documentation. But the following timeline is one of a few statements reported in the press that F&F began in Sept. '09.
Gun-Running Timeline: How DOJ’s ‘Operation Fast and Furious’ UnfoldedOperation Fast and Furious Timeline:
September 2009 – Jan. 8, 2010: A Jan. 8, 2010 briefing paper from the ATF Phoenix Field Division Group VII says: “This investigation has currently identified more than 20 individual connected straw purchasers.” It further says: “To date (September 2009 – present) this group has purchased in excess of 650 firearms (mainly AK-47 variants) for which they have paid cash totaling more than $350,000.”
I don't suppose a briefing paper from the ATF Phoenix Field Division is what you call proof but it seems like enough to bring into the discussion to me.
I think someone said that was about the time that some reports say that Zetas broke off from the Gulf Cartel.
I have seen reports that did it in early March and other reports that it wasn’t until 2010.
But it doesnt really matter because we were supplying them to all the Cartels.