I think the bug activity should have been higher no matter what, which is why I assume Casey cleaned it up as much as she could. Maybe she thought she could get rid of the smell by cleaning.
Apparently Vass said the decomp from the carpet could have been anywhere from .7 to 2.6 days. So maybe the bagging happened closer to 1 day into the process. We know Casey went back to the house on the afternoon of June 17. (And on the 18th for the shovel.) Perhaps Caylee was just lying in the trunk in the parking lot of Tony's apartment on the night of June 16 , and the bags were not involved until the next afternoon.
I'm leaning toward the very quick trip to the house area on the afternoon of June 20 as "dumping day." That night, Casey acted in what was, according to her friends, an uncharacteristically drunken manner at Fusian--Hot Body contest, running up Tony's tab, babbling about how she could be a professional singer or whatever.
Personally, I think Casey's drama about keeping George away from the trunk on the 24th was more about not being caught with the gas cans than anything else. Remember, she had just denied having them. IMO she was racing him to the trunk so she could grab the tire wedge he was pretending to want and close the trunk before he saw the gas cans. But he was too speedy and she was forced to admit taking his "f*ing cans."
BBM. Do you [or anyone] think George smelled decomp on the 24th?