Steve,
To elaborate a bit on Jerry's comment, the red-hot needle test on plastic grips will enter the material and smoke and smell like plastic. There is a composite ivory material, finely ground or powdered ivory suspended in a resin. If you try the test on this material you will get the smell of burning resin, different from both hair and plastic.
I agree that the surface of the grips look pretty shiny. The lack of a mellow yellow color may not be diagnostic, this color only comes with use. My own ivory grips were parchment white until I installed them on a Luger and started shooting it.
The grip backs would be interesting.
--Dwight
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