The problem with trying to find JW's fingerprints or DNA on or in any of the family vehicles is that he was probably in all of them at one point or another, and any hits could not be tied to a specific day or time. Probably the same for inside the house (at least in certain rooms).
I'm beginning to think the police never believed his story about dropping the cash in the red car in the garage. First, he lied about it, saying first he found the key and unlocked it, and then that it was unlocked. Under stress I might see him saying first it was unlocked and then remembering he had to get a key, but not the reverse sequence. You don't misremember that you found a key. So, that alone makes his red car tale highly suspect.
Second, the direction for him to place the money in the red car was given to him by SS on the phone according to JW's story, not by text, so there is no text on anyone's phone that confirms what was said. Further, if the contractor's explanation of the security of the garage door and entry door from the garage into the kitchen is correct, I don't see DW figuring out how to get into the garage, open the door with a code, and then close it later (unless SS taught him, which is unlikely because there is probably a panic code that can be entered to sound sirens and SS would have given him the panic code).
JW may have just sashayed into the house, divided the money up with those inside, and got out of there.
