Undigested shed skin?

Today I found in one of my leopard gecko tanks a rather large white...thing. At first I thought it was a dried up egg (it was about the right size) but on further investigation it looked like it was a tight clump of shed skin. I saw some scales, but it was very crumbly after I messed with it. So can a gecko poop out shed skin? At least, is this normal?

Shed skin is a huge meal for them, so sometimes they eat too much, and end up regurgitating them or pooping some undigested parts out. It's normal.