Actually there's no secret to opening the box!
Japanese Karakuri Puzzle Boxes: New Secret Box No. 3
This is New Secret Box No. 3. Highest level in this series with 18 moves. Collecting all three of this series of boxes which are made of quality wood and craftsmanship serves as an exquisite interior decor when not in use. HAND MADE IN JAPAN
Karakuri Creation Group, founded by Akio Kamei, is a group of craftsmen specializing in design and crafting of Japanese trick boxes, or Karakuri Puzzle Boxes, known as one of the best wooden puzzle box makers in the world.