Unknown Karakuri Box

Unfortunately, I forgot the information about this box. It is definitely the work of the Karakuri Creation Group. Perhaps Akio Kamei's "Letter Box"?

If you have any information, please let me know. 

*Puzzle only. No attachments included. 

*I don't know the solution so I cannot to reset this box. This is as as-is item.

Size:250x86x70 mm.

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Ship from Tokyo, Japan. (So my English is very poor, sorry)
*Payment can be only Paypal or Wise. If you choose Paypal, it costs extra money to handling fee of Paypal(4.5%)
(*Please refrain from paying immediately as we will inform you of the total amount after purchase.)

The shipping cost $30 (Actual shipping costs will be determined after the end of the auction.) 
*I can ship together other items.  You can save the shipping cost. 
*It has tracking number.