4 layer box


French - Belgium

What do you think a "4 layer black box" is exactly in the following sentence:

"Your keyboard should be in the middle of your desk and your phone either on the right or left hand side, along with the ‘aide-mémoire’ and 4 layer black box to put in all of your personal working material"

Une boîte à 4 étages ? Un bloc tiroir ?? Une étagère à 4 niveaux ???

Thank you for your help !
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