my personal feeling is caylee was in there or there was evidence that caylee had been in there, and knowing her dad is ex-LE she was bond and determined to keep him out of there. I also believe george is kicking himself for not actually looking in there.
I too have a feeling Caylee was there at that time.
Timeline of Caylee going missing would've been a week by that date, June 24 ...so it is certainly possible she was there. Nancy's new FP (don't remember his name...guess Dr. Kobi is persona non grata now?) said tonight that a body would be odiferous in a trunk to the point where it would be noticed from outside by about 36 hours...definitely very noticable by 10 days.
No wonder she ran past her father in the driveway swearing and swore again as she shoved the gas cans at him. Too close of a call for her.