You
should not need any special scarifying tricks to get germination - I would keep them in the ground, out in the rain and cold with a wire cover on top to keep out rodents out.
If you want American Chestnut I have some 50-100 year old
trees to harvest from -- the
deer and squirrels don't leave them around for long.
Mine are close to you in Longview, WA -- anybody from the area can message me if interested .