He may have removed them from her car or purse. We know she had 2 appointments in the city that day, and she may have been taking them with her- in purse, tote, briefcase? I know when mine were little, in making lunches and packing my things up, I would often put my case, school needs etc, in the car the night before, so I wouldn’t be bothered with it in the morning. With 5 other people to feed, help dress, and get out the door, I’m betting she did an awful lot the night before, while they were asleep.
I know we’ve discussed JDs phone, but I don’t recall hearing anything about her purse.