-two are in the maze area, one towards the very bottom right of the screen (before you enter the maze) and the other somewhere towards the top left of the maze
-one inside muffets ass, go to where shes stuck in the wall and take her panties off and it will be there
-one in the room with all the colorful names where you get the first magazine (at the beginning of the game)
-one right before you cross the bridge