Foster Care Support Group
Foster care is a system by which a certified, stand-in parent(s) cares for minor children or young peoples who have been removed from their birth parents or other custodial adults by state authority. Responsibility for the young person is assumed by the relevant governmental authority and a placement with another family found.
I don't think there's anything wrong with asking your boys' caseworker how they're doing. When our FD moved on, our caseworker asked us if we would like updates (we said yes) and at what frequency (every few weeks).
Okay, I am almost positive that's all I have to say!
I know waiting is frustrating, but like the other poster suggested, there's no reason why you can't continue to pass on messages in the meantime.