Do you need to use more litter when filling the box with this kind? I am having trouble finding bags smaller than 30 lbs (unscented) so i'm wondering if you just need to use a lot and that's why it typically comes in a large bag. I tried to buy (5) 6lbs bags on Amazon but only one made it to me. The box was damaged an looked like it had been open. And smaller bags I see are almost the same price as the 30lb.