Welll, the odor got bad here too.
Then I went to the store and got some puppy trainning pads with baking soda in them and some pine shavings. The pads absorb any moisture that got through the shavings and both me and chicks were happier.
Now they are 5 weeks old and in a largefreezer refrigerator box in my living area. No smell. I add some fresh pine shaving everyday. I only have 6 though. At day three I change everything out and put the shavings around the many berry and fruit plants I have. Over the winter this will break down. New puppy pads and shavings then go in..
I am in the process of getting a coop area set up for them with a heat light. It is very cold today here for this area and they will not be as warm as they have been in our home. I have a thermometer set up and will check the temp early in the am to make sure it is high enough for them. They will go out at 7 or 8 weeks. jean