Blink mentioned earlier on that there was a shovel seen in Cindy's garage during an interview or during a pan of their property. Strange that Casey had access to the garage area if George's account on the 24th is correct and she came in through that door. So if they kept one in garage, it makes no sense that she borrowed one anyway.
You may not be so far off about that "cup of sugar" thing and it popped into her head because of the locked shed. Interesting.
Another thing I wondered is since she broke into the shed to steal the gas cans on 6/22 or so, couldn't she just as easily broken into the shed to use the shovel on 6/17 or whatever day it is that she needed it so badly? I mean, not like she couldn't lie her way out of it if her parents questioned her about it. She was digging up bamboo so Caylee wouldn't hurt her feet. give me a break...