Here's an image of the folder that the logs are held in. http://puu.sh/oIIsI/496a801604.png
Here is the file in the image that is on 05/04/16
This one is fml-server-3.log
This one is from fml-server-latest.log
Other than these files, I'm unsure as to how to get the any other specific one you may be speaking of unless told otherwise.
But by all means, if you see the file in the list of the first picture please let me know so I can retrieve it for you. Thank you for all your help!