Perhaps something was done in the garage and the perp(s) used large garage door to exit with them. Still astounding to me that nobody heard anything, or saw anything.......or was woken up in the night by "something" that they maybe can't figure out.
Surely to God a K-9 unit/tracking dogs should be able to determine something?....but maybe that's not so easy given that this was their home, their scent could be picked up everywhere from just their usual comings and goings, walk to tennis courts/park behind the home, etc.
I wonder if it's pertinent, the fact that there seems to be various reports of "where" they told neighbors they'd be relocating to.........the U.S, northern AB, Mexico. That's quite a variety.
How quickly did they sell their home I wonder? Were they planning for some time (months?) to sell and move away or was it more of an impulsive decision? Could they have been running from someone?.....though seems unlikely given that they had a rather publicly advertised estate sale.
My feeling is that the poor little boy just happened to be at the wrong place at the wrong time. Maybe if this was planned, perps had no idea of the seemingly last minute decision for little boy to spend the night?
Did perp(s) hide out somewhere in the house after having been there at the sale.........lying in wait, so to speak?