The wires just came through the top of the boxes though and were coiled up inside. We used deep single gang boxes. You know you have the deep ones because they are about the same depth as the two by four studs.
Resurrecting an old one...
How did you wire for the sirens and the motions? You didn't have a single-gang box behind them, did you? If not, how did you keep the wire accessable when the drywall goes up?
Thanks for the info BSR...doing my wiring for my house in a few months, and trying to be as prepared as possible.