I have had great success with rubbermaid containers with a hole cut in the lid. I just use coconut fiber and get it nice and moist. It usually stays moist for 2 weeks but since im checking it daily i feel it too check and if it is too dry I give it a spray. My females has laid it in 3 times already. Humidity is important. The box should always be a little more moist then the cage. The gecko will almost always choose it over anywhere else