It all depends on what the definition of "Improper" is

From AG Gonzales' second Washington Post op-ed piece about the "overblown personell matter":

I have nevertheless asked the Justice Department's Office of Professional Responsibility to further investigate this matter. Working with the department's Office of Inspector General, these nonpartisan professionals will complete their own independent investigation so that Congress and the American people can be 100 percent assured of what I believe and what the investigation thus far has shown: that nothing improper occurred.

So, the DOJ will investigate itself. But the boss has already reached a conclusion.