Where are the berries?

Ezra told me with his impressive sign language abilities that he would like some grapes. I didn't have any, but decided to see if blueberries might fit the bill. I gave him a few, continued doing the dishes, and when I looked over the berries were gone. Well, he really likes them let's give him some more. Roughly two dozen berries later I catch him putting a blueberry down the front of his pajamas. Upon closer inspection I discovered this: