I feed my baby BP in its enclosure and it swallowed a few pieces of the substrate too. I use cypress mulch. I didn't want to try to help remove it from the mouse because I didn't want to stress Jade out and have him regurgitate. I figure that they can digest bone so it's nothing to worry about, but please let me know if it's a concern and what, if anything, I should do in the future. Thanks :-)