Double box

The trick of this work is greatly improved from the "PENTAGON (M-8)" created by Kamei in 1984.
The lid with purple line comes off easily but this is not an answer.
The hint to open this box is "the lid".
The apperance is so simple but the solution must make you surprised...

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●Craftsman : Karakuri Creation Group
●Size(body): 120×85×58mm
●Size (storage) : 41×77×34mm
●Materials: cherry, walnut, etc.

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