Yeah, ball pythons always eat better in their enclosures. I have been keeping mine on aspen shavings for years, feeding inside the enclosures and have never had any issues with impaction. I have found aspen shavings hanging out of their mouths after eating, which makes it look like they were just scraped off as the rat went down. I just pull those off with feeding tongs if I see them. I have never seen any kind of wood fibers in their stools at all. I really don't think there is much to worry about.