FUNK Acrylic Puzzle - Bacon Magic (SM3)

FUNK is an interesting puzzle product produced by Bacon magic. There are four thick irregular transparent pieces in the box. Please try to form them into a rectangle.

This seems to be a simple jigsaw puzzle, but it's actually very difficult. If you find it difficult, you can refer to the correct illustration attached to the packing box. 

Give it to your friends and see if they can challenge successfully!

NEW, but box has damage.

NOTE from Don: This puzzle has so much good potential, but the pieces aren't perfectly cut.  So, even when you've found the solution, you might not realize it's complete, because of the mismatched size of pieces (see photos).