There is a small drain tube at the bottom of the box, inside the car. It drains through an adjacent hole in the floor. This is available from Brookhouse. It often gets broken off, so any water in the box then drains into the car. Note, if the tube is original it has a small plastic spreader bung in the grommet part to make a good seal. Make sure you retain this for use with a new tube as it isn't available new as far as I know. I don't even think it's in the parts book. The box can also rot out at the bottom which then leaks so yours might be a victim of that.
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