-First, many thanks for this forum. The best info on the S40 in this solar system.  
-I bought a 2006 S40 in Miami and imported it to Nicaragua were I live. It seems that it is the only one in the country and there are no spareparts around.
-The tool box cover was missing and I checked the internet. Expensive, are they made from gold? Transport to Nicaragua ridiculous expensive!! I decided to make one and fiddled with a carton gift box to get the size right. (Black box on the picture) The final one (light brown) is made from 4mm PP sheet but PE or PVC will do as well. I suppose that plywood can also be used. PE and PP you have to weld, PVC and wood you can glue. The cabinet latch (pictured) hooks behind an L shape piece of PP that is fixed with the screw next to the battery case. (pictured)   Sizes are in centimeters. The nail is hard steel. After spray painting with fake crome, I will post the final result. The green primer is now drying. If you use PP or PE you have to score the surface with rough sandpaper to let the paint primer stick.  
-Hope you do not loose your toolbox cover but if so…. Good Luck
Greetings from sunny Managua