Well, it was in the Organizer, located on the top right in my PSE program. I don't have a clue why they are saved there but it's all items I've worked on while editing and creating digi pages. So good to go in now and then and clean up. I keep my pages in my My Pictures folders instead, so don't need to store them twice.
Good luck cleaning! Put on some good music to push you along, as it's about as tedious as dusting!