That is, in itself a clue. Are not the black boxes normally located in the tail section because the tail usually has the least amount of damage during a crash?
That they would be so heavily damaged indicates the tail went through an abnormal amount of damage which is itself an indication that a bomb damaged it, probably sheering it off.
Satellite infrared shows a flash and a separation. It shows no missile launch r flight.
I think I saw the pictures of the flight recorders at the Daily Mail. The story line was they were too heavily damaged and showed them all twisted up.