I agree with Jurgen that if it's part of your job then you should have an authorization. If you can't have it then maybe you don't need to know this information.
You could also try searching for the IDoc in WE02/WE05 transaction if you know at least the approximate date/time when output was processed. You can see a list of segments there as well, so just chose the segment that contains the delivery # (sorry, I don't know those IDocs well) and then search for the delivery # in the list.