@ErinM31 Yes, prey disappeared and moults would appear in return. I keep detailed moult records and for these two all I have is 'Sometime in <insert month>'. I still haven't seen the other one - I lucked out with this one. There were times that I questioned whether they were still alive even, but then a moult would be out for pickup and I relaxed again.
I would shine the penlight down the hole each time I fed and watered and, if I was lucky, I would maybe glimpse a foot. I never knew if it was a real foot or a moult being taken out gradually.
Thanks @cold blood.