Just imagine for a momment they find that baby girl hidden or buried somewhere in that house?
OMG...I know. I am so scared they will. But, wouldn't be terribly surprised, either! What if that day they left(if they actually even left!), they came back after George left for work? It was said he was about to leave for work, right? She knew when Cindy would be home. Casey could have driven around with that baby in the car for 10 min. or so and came back. Shoot, they could have gone to get a happy meal. Then, when she got back, she had a few hours, at least.