The media sometimes gains access in various ways to pertinent information, but if it cannot be confirmed by LE, it becomes moot. IMO, it is important to not release ANY information that may compromise an investigation.
IMO, the truck was seen more than what has been released. I would go as far to say that it is possible that CCTV also caught *something* in the back of the truck. It may not just be the CCTV camera that caught the truck earlier.
If information was leaked by someone on the construction crew, I'm pretty sure that all times that the truck was seen on video would have been leaked, not just the time prior to the murder. We have one photo, we know that the truck was seen more than once and, given the angle of the camera, I have no doubt that there is another photo taken after the murders - where the victims will be in the back of the truck. Point being, that all times that the truck was seen on video would have been shared (if someone was leaking information), not just the obvious time prior to the murder where the back of the truck is empty.
On that basis, I'm inclined to believe that the suggested timeline associated with the photo of the truck can only be speculation that is based on the fact that the photo appears to have been taken in the evening or at night, and the bed of the truck is empty. That suggests that the photo was taken prior to the murders ... so anytime after 9-10PM
It's interesting that police were photographing a basement window that is exactly on the opposite end of the house to the upstairs bedrooms. As was suggested yesterday, this seems like a very good way to break into the house. If Garland broke in through a basement window, he could have hidden in the basement until he was sure that everyone was in bed, or he could have entered through a basement window some time after the lights were out.
Israel Keyes said that he cased a house to learn the layout, paid attention to where bedrooms were - last light to go out at night. He liked to enter through garage windows, but a basement window probably works too. What he did was wait for the occupants to go to sleep, and then did what he called a "blitz" attack, where he suddenly stormed through the house, burst into the bedroom, and completely caught the occupants off guard. Russell Williams, the former military man from Ontario, did pretty much the same thing. He cased the house, found a way to break in, entered the house, waited for the occupants to go to sleep, and then surprised them when they were sleeping.
Interesting point about security bars on basement windows ... a few years ago I was looking at open houses, and I learned that many people have keys for the basement security bars within inches of the bars. There has to be a way to open the security bar in case of fire, so what people very often did was place the keys on a nail right next to the bars ... kind of defeating the purpose of security bars.