"Statement soon on reports that one of our laptops with personal info was hacked. We never had info in question. Bottom Line: TOTALLY FALSE"
In a statement to AllThingsD, the FBI added,
"The FBI is aware of published reports alleging that an FBI laptop was compromised and private data regarding Apple UDIDs was exposed. At this time there is no evidence indicating that an FBI laptop was compromised or that the FBI either sought or obtained this data. "
Anonymous said it released the data, part of its Antisec campaign done in concert with LulzSec, because it wanted to publicize the fact that the FBI had collected and was in possession of such data.
Now, though, with the FBI's denial, the question is, where did Anonymous get the data? At least some of the UDIDs in the database have been confirmed to be real, so there's no doubt there is real information in there. Where it actually came from remains an open question.
Those who wish to check to see if their UDID is among the 1,000,001 UDIDs that Anonymous released out of the more than 12 million total that it says it has in its possession can run it through this tool.