I've just checked my saves and my other sources for saved games, but unfortunately am unable to find any for this. The game shouldn't have allowed you to progress without your picking up the pencil. Have you tried scrolling all the way back in your inventory, in case it is tucked away near the beginning of the inventory bar?
Let's wait and see if anyone has kept their saves and has one near the spot you need.
"Bleat, Watson -- unmitigated bleat!" ~ Sherlock Holmes