No, we definitely do NOT know when the body was dumped. Caylee could have been thrown into the truck at first, then when decompostion began, KC panicked and move her somewhere else. Or she could have had Caylee elsewhere at first, placed her into the trunk for those 2.6 days, decomp because unmistakable and she was moved again. There could have been several moves.
I know someone said she would have been difficult to move with the fluids and all, but she did end up in the woods, so somebody had to have moved her, so why not more than one move?
We'll find out about the cooler when they tell us, IF they tell us. How large was this cooler?