I agree it is a big box but it is for 12 discs,please see below.

Amps 12-way Black DVD Storage Case

These cases are for the storage of 12 CDs or DVDs.
Designed with five detachable inserts, each holding 2 discs (one on each side) and discs on the inside of the case structure.

Colour: Black
Dimensions: 135 x 190 x 40mm


They can be bought from here http://svp.co.uk/product/amps_12_way..._case_0108_x50