All the packed primitives are rendered by the plugin, but not this feature is not going to instance the geometry while working with the copy sop. From the scene point of view, while extracting the information, the copy sop is not seen as an instancing tool by the HDK. All the geometry is unpacked and converted to geometry, so instancing at SOP level is no possible. You need to use the conventional instancing at OBJ.
Hope this helps,
Computer Graphics Software Developer
Octane plugin development and support: LightWave and Houdini