Never noticed before that the key has a number on it. Just hope it is a meaningful one, as the key that came with the Bongo has the old Mazda Lotus flower on it, so may be original.
It is possible to loose both keys to a car. My ex did this and when he went back to Land Rover for the key number found the one on the records did not match


Finly he found someone who used to work for him still had his key, but that was very nearly three new door locks and ignition lock. Too close for comfort.