unless you has some sort of lens that focused the moon on the paper, i think the brightness of the moon
might have just "fogged" the paper.
perhaps if you rig a secondary glass / meniscus lens on your pinhole camera that can slide into position
as the pinhole slides out of the way, you will be able to get an image of the moon as you expected. they suggest the "perfect"
exposure of the moon to be "sunny 16 " ( full moon ) so it will be a short exposure ..
great images you posted ... i am a big fan of long exposed paper !