We have a winner.
That is great work.
Now, why the disinformation on the part of the Fibbers?
To have the enemy relax, or to buy time before action that would be demended once the info is out, or to have the US citizens deluded for some unknown benefit, other reasons?
The answer to this question is, IMO, critical.
The FBI said that published reports on this were "not accurate." The newspaper reports that they deny say that both Khan and Gurung had lived at that address. Taken literally, this is probably false. Khan lived in Jersey City (at the Tonnele Ave. address we've seen); he probably maintained the Chicago apartment, but he probably didn't actually live there. Sabash Gurung also didn't actually live there, apparently; his brother Sushil lived there, and Sabash was just staying with him (temporarily?).
So the FBI may be telling the truth, just not the whole truth. (That's OK in principle -- they shouldn't be telling the public everything they know.)