There is a U-shaped clamp on the rear of the fuse box lid. Press the U together at the absolute rear and lift the lid up. The ends of the U are clamped in the plastic of the fuse box and function as the rotation axle.
Push the U together, lift the rear of the lid and take it off completely...

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)