Here is one link to the September 2008 documents released that mention Casey's statements about squirrels and the odor in her vehicle:
http://www.foxnews.com/story/0,2933,427045,00.html
The above link is old but this is when that information came out.
Here is one of a few links about Henry Lee inspecting Casey's car:
http://www.cfnews13.com/Features/CaseyAnthony/KeyPlayers/ExpertsAndConsultants.aspx
On that link just scroll down to the name Henry Lee.
On this link (direct transcript from the Nancy Grace show in which Grace speaks to Dr. Lee...he talks about all that he has examined in relation to the car) I snipped a portion of it as it refers to the car/odor and will also provide the link:
GRACE: Well, Dr. Henry Lee -- everyone, with us, he is on the Anthony defense team -- I know that you have the highest regard for the Oak Ridge Laboratories in Tennessee. I trained there myself for a period of time. According to them, and their -- their specialty unit, the "body farm," there was evidence of human decomposition. Would that be consistent with the smell that you smelled, Dr. Henry Lee?
LEE: Here, that`s -- you know, I`m a scientist. I only can address some scientific issue. I cannot speculate. Decomposition, because the trunk -- don`t forget,
I looked at not only the car. Also looked at the liner, the carpet. Also looked at the content of the material. And I don`t know anybody informed me or not -- there are a lot of garbage was collected. A lot of material was collected from the trunk.
GRACE: Like what?
LEE: Like what? Like food, like meat, like pizza box, like cheese, like ham, box (ph) of soda, and all different material in there. So basically, a lot of maggots and a lot of insects, all kind of material mixed together. So I cannot really elaborate too much on what I found because this is an active case. I cannot really reach a conclusion at this moment.
http://transcripts.cnn.com/TRANSCRIPTS/0811/17/ng.01.html
I don't know the date of Dr. Lee's examination of the car itself but he arrived at the CSI place with Baez to inspect it. I don't know if or when he inspected the contents of the garbage bag found in KC's trunk.