I just lost a female this week who was gravid. She had 40 eggs inside her. I dissected her just to see if I could see anything out of the ordinary, and boy did I. The last 3 inches of her digestive tract was absolutely packed with sand. It was swollen to the size of my ring finger and was as hard as a rock. I had always had trouble with this particular female when she was gravid. I had been palpating her and I knew something was definitely wrong. It felt as if though she had a rock inside her. I have never used a sand box within a females cage until her, because I've always been able to see the signs of when they would be ready to lay. I gave it a try with her because she was so problematic during her pregnancy, and I would constantly catch her eating the sand. I know alot of experienced keepers on this forum insist on keeping a sand box in the cage for egg laying, but in my honest opinion, I would take it out if she is eating it. I would post the pictures of her 'autopsy', but they are horrific.