The other 2 bureaus have probably been working overtime making sure they haven't been hacked... or trying to figure out the best way to say "we were hacked too..."
It may be time for our government officials to start looking into a plan to give those affected new SSNs. Yes, it's a nightmare scenerio, but now that some other nation of hackers has everything on us, we now need new banking identities. The number 1 responsibilty our government has is to protect it's citizens. This is cyber war and we have been hit.