Hakone Trick Box

I bought a rare box from my trip to Hakone.  It's called many names but it only comes from Hakone. 

From Japan

From Japan

It is a trick box (link) that can only be opened by following a series of steps.  Mine takes 27 steps to open.  It's intricate decoration is beautiful and it is designed to confuse the untrained user.  I made sure I have photocopies of the instructions to open it so that I always have a back-up.  Now, I need something classified to put in it.