Hello Chris and Welcome!
In addition to the four 100 round drum magazines, this chest would have held the crank for winding the drums while loading, and a metal support plate the drums would have been mounted on during the loading process. I cannot recall if it also would have held the adapter for mounting these drums on top of the Bren Gun.
Personally, I think your find has survived rather well and I would be inclined to let it show its age gracefully.
If you had to go a repainted route, my personal choice would be to take the item in question to a local Home Depot, or equivalent, and have them scan the item to mix up a modern full flat or eggshell indoor/outdoor latex.
David
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