These pictures, taken by Allen Shope and posted to the IPDB confirm my suspicions. Why? Why would you remove these helpless figurines from a machine? Why? For the love of humanity!
All drama aside though, you can see in the two pictures above that my Shadow is indeed missing a Mongol figurine just to the left of the left ramp, and missing another over by the upper-right flipper.
You can also see from the picture on the left that the machine should have a small plastic cover over the left ramp entrance. The picture below shows the one that goes over the right ramp:
