If the house was constructed in the way it should be the ceiling lid would go up first, then the siding then the trim. Those voids should not go in to the attic or anywhere else. That said it doesn't mean that a bat wouldn't use that 3 inch space to habitate, they love those little nooks and crannys. I'm guessing that if you shoved a stick up in to any of those openings it would stop where it meets the ceiling.