The NY Times provides another example
For two years now, Representative Darrell Issa of California, the hard-charging chairman of the House Oversight Committee, and two deputies, Representatives Jason Chaffetz of Utah and Trey Gowdy of South Carolina, have pursued the details of a 2009 gunrunning investigation by the Bureau of Alcohol, Tobacco, Firearms and Explosives that went awry.
Seeking to build a bigger case against high-ranking gunrunners, agents did not move quickly against weapons obtained by low-level smugglers in the gunrunning operation. The agents lost track of 2,000 guns, most of which probably reached Mexican drug cartels. Two were found near the scene of a shootout in which a Border Patrol agent, Brian Terry, was killed.
The 2009 operation was ongoing in December of 2010 right up until Brian Terry was killed.
Saying that "agents did not move quickly" against straw buyers and that they lost track of the guns is certainly part of the truth, in addition to being an excellent example of why courts ask people to swear to tell the whole truth.
On orders from superiors, the agents did not act quickly against those buyers, and when the agents were ordered to lose track of the shipments in various ways, they did as ordered. When you put it that way, it kind of suggests a different problem than the one the NY Times and the rest are suggesting.