i wouldnt be asking them when they want their stuff at all if they left owing me money. I had the same thing happen to me. I was told that i could not withold their stuff in exchnage for payment but i did make sure that I had the stuff ready to go at "my convenience" I think that if you havent hear from them in a couple of weeks, chances are they arent going to contact you. I'd use the diapers as spares when needed and if the clothes are good for other kids in your care, keep them for back up. Otherwise I'd donate them after 30 days.