Do Steno's have calcium sacks?

[desertgecko]

Do female stenos have calcium sacks? I'm curious as I've had a pair of s. sthenos for about 3 years now and this is the first time I've noticed these sacks. I don't dust the crickets are they are quite small but do leave a small bottle cap of calcium in the tank.

If they don't have calcium sacks, what do you think it is? I shall try to get a pic later.