OK with a little searching with the right words I found:
"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..."
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)