The DOJ IG review of Gunrunner at the time of Fast And Furious. If they didn't get wind of it, they noticed lack of communication and discrepancies in data in reports.
EXECUTIVE SUMMARYThis review by the Department of Justice (Department) Office of the Inspector General (OIG) examined the impact of the Bureau of Alcohol, Tobacco, Firearms and Explosives’ (ATF) implementation of Project Gunrunner on the illicit trafficking of guns from the United States to Mexico.
[snip]
The OIG conducted this review to evaluate the effectiveness of ATF’s implementation of Project Gunrunner. Our review examined ATF’s enforcement and regulatory programs related to the Southwest border and Mexico, ATF’s effectiveness in developing and sharing firearms trafficking intelligence and information, the number and prosecutorial outcomes of ATF’s Project Gunrunner investigations, ATF’s coordination with U.S. and Mexican law enforcement partners, ATF’s traces of Mexican “crime guns,” and challenges that ATF faces in coordinating efforts to combat firearms trafficking with Mexico.
[snip]
Despite the increased ATF activity associated with Project Gunrunner, we found that significant weaknesses in ATF’s implementation of Project Gunrunner undermine its effectiveness.
It's a rather lengthy document that shows failures to communicate across agencies and between offices. It also details data discrepancies between ATF and the investigators. I can't say whether the inconsistent data was a result of sloppy operations or because of "off the books" operations going on at the time of the investigation.
Nor can I say that the Inspector General's office dug more deeply into some areas than in others.
-PJ