SPOILER FOR THE MISSING PANEL
.... So now you know.
Spoiler!
The pillows used by the Vomit dragon are the 3rd and 4th pieces. Now Lloyd needs just one more piece, which was last with the Lazy Dragon King (Vomit dragon's son) when he was researching interdimensional travel. He basically sent random things to different dimensions and now the 5th piece is in Seoul.