To add to the timeline shenanigans: Caleb explicitly says that the storage locker was rented four months ago, either the day Mona was murdered or the day before. That puts us at Thanksgiving plus four months, i.e. late March. So... assuming our intrepid heroines graduate on time, anything that the show wants to do before they graduate high school has to occur over the span of something like six weeks. Looks like we're in for another time distortion bubble, like the one that occurred between Halloween and Thanksgiving!