Four-Leaf Clover - Karakuri Idea Contest 2017

As with the best of Karakuris, this 2017 Karakuri Idea Contest winner beautifully integrates its theme with its solution.  The top of the box presents a field of clovers.  What do you need to do in this field of clover to get the box to open?  It's trickier than your first guess might suggest.  And, if you do solve it, what possible mechanism could possibly make it work?  All original packaging included.

Ordinarily I'd include Karakuri's product description of the puzzle, but it is a bit spoilery.  Please click through on the following link if you are ok with this: Four-leaf clover puzzle description.  The puzzle is based on an idea by Miharu Suzuki and was hand-crafted by Akio Kamei and Kyoko Hoshino.

Size: 150×100×68 mm

Material: keyaki (zelkova), purple heart, magnolia

Condition: There is some minor discoloration of the wood in locations not visible in the unsolved state and only evident as you solve it - exposed wood portions darkened a bit over time, while some limited, otherwise unexposed portions retained a slightly lighter color. This discoloration is not shown as it would reveal part of the solution but can be provided upon request.