I seem to be missing piece #504 from my 540 pc puzzleball globe. How can I order this piece and complete my puzzle?

SOURCE: Problem putting ravensburger junior puzzleball (3D) on lightstand

i can help you

SOURCE: i have a Ravensburger Puzzle Ball Globe 540 Pces

To complete puzzleball, assemble the last 5 pieces together before putting them into the ball itself, and then add them to the rest of the puzzleball. You may find it easier to roll the ball along a flat surface, to help ease the pieces into place.
For more information you can go to ravensburger.com/puzzleball/instructions and they give you a step by step guide on how to complete it
Hope this helps