1) There isn't a specific reporting tool built into ClassiPress, but to clarify, customers actually cannot delete their ads, so the IP and post date information will be stored in the ad screen in the
wp-admin where they cannot edit it. You may be able to find a plugin that can extract this data, or obtain it directly from the database.
2) I'm not aware of any specific plugins for this, so it may take some custom work to do so.