It is not unusual for these kits to be mismatched. The numbers should all be the same, but it isn't a real big deal if they aren't. The empty cavity is for storage of the ejector. When you install the sub-caliber conversion unit, the normal ejector for the 9mm cartridge is not needed. There is no provision in the conversion breechblock to accomodate it, so it was intended for the ejector to be removed and stored in the case so it wouldn't be lost.
As the others have indicated, you have inherited a really marvelous rig. Congratulations. It is rather unique in several respects, so from a collector's standpoint I would be a bit reluctant to shoot it. It is an excellent example of the marriage of two eras and it would be indeed unfortunate if it was damaged by firing it. They just don't make them like this any more.
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If it's made after 1918...it's a reproduction
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