They should have cracked by now. I'd say get some potting soil, water it really well, and put the seeds just under the surface and let them germinate there, just to be on the safe side. Don't let them get cold and keep the soil nice and moist. They may be old seeds so may take longer to germinate. You could also keep them on the wet paper towel and just put them in a warm place, if they aren't already, but don't let them get hot, just warm, like on the TV or just in a warm room.