It could be his phone just ran out of power, but I assumed he was trying to ensure LE would never be able to link him with Hagerman through late night calls on his phone. There's no sign he was trying to hide on the 10th, he went to the hangar and had business meetings.
*If* he was just dropping off his toolbox normally full of drugs and it contained nothing to do with the TB murder, why wouldn't he use his own phone to contact MH. I guess his phone could have died but that seems like a very convenient time for it to happen. I guess I would have expected a question from TD like "Was this the first time DM ever contacted you through CN's phone or was this a usual thing he did?"
I know he wasn't trying to hide on the 10th but if he was hiding when he dropped off the toolbox, that would show to the jury I would think that there was something definitely linked to the murder in that box.