Second Grade Sneaky

The girls think they are so sneaky, but they are in that innocent sneaky stage still.  They giggle because they think they are getting away with something without realizing they've forgotten to cover their tracks so eventually they will get caught.
We find things like candy wrappers stuffed into their toybox and juice boxes in the basement garbage can.  They try to sneak some contraband like markers or pens upstairs by putting it behind their backs and trying not to laugh.
Today I opened the freezer to get some ice cubes.  I saw the M&M bag open.  We have been keeping a big bag of M&Ms in the freezer during the hot weather.  I hadn't eaten them and I'm pretty sure Oreo didn't suddenly develop the skills to get into the freezer.  Even if he did, I doubt M&Ms would be his first choice.  One of the girls sneaked into the freezer to grab a handful.  Instead of wrapping the bag back down, the top was completely open.  
I know I should be mad, but I find it so funny.  They are trying so hard to get away with something.  What's really funny is I'd probably give them the M&Ms if they asked.