The excuse is that it’s been that they’ve, turned it over to the Iraqi Government* “to pressure Tehran to curb the flow of Iranian weaponry and explosives into Iraq.
Of course, these weapons are primarily going towards the militias of Dawa and ISCI, who are, nominally at least, the government in Iraq.
The reality is that they are doing what worked so well for Joe McCarthy. Claim to have a list, and use it as a club, even when no such list exists, or when such a list is so poorly made as to be laughable.
I imagine we’ll see selected leaks when Maliki attempts to use it for partisan political advantage during the provincial elections.
*An oxymoron if there ever was one.