It was just a suspicion. You should know soon. How long would they last with T2 on the board?
edit: I don't know, but the gate on it is only disabled (gate high) by the voltage on Vin being higher than 6.6vdc. If you power the device with +5v, the gate is left low, which enables the fet T2. They don't do a great job conduction reversed, but they do.