The VD's found their alarms were on and different doors were open. (more than just the one Denise thought she might have left open)
When DW came home Saturday, and was told Danielle was gone, and he went to look in his yard and pool to see if perhaps she fell into it and drowned, he found his side garage door was open.
Wonder if the police made any investigation into other neighbors? Did anyone else report finding doors open? Could there have been a theif or pervert roaming the neighborhoods, breaking into garages/houses. Maybe just garages, and at the VD's , maybe he/she got lucky and found Danielle wandering around sleepwalking. Walked her right out the gate (the gate Damon found was unlocked Saturday morning).