If you get purple materials, that means that the object doesn't have a material assigned, or it is not valid. The materials are assigned at OBJ level using the Material parameter, or at the SOP level using the Material SOP (that configures the shop_materialpath primitive attribute). The workflow is the same found in Mantra, so you can check the Houdini docs to learn how the materials work in Houdini.
Well, as you can see there are no problems with the materials in this scene once configured. The only problem is that of course the exterior package doesn't allow to see the internal money object if it is opaque, so in this scene I've made it near transparent. Attached you have the scene.
Hope it helps,
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