I hate nothing more than when someone figures out the answer and then says 'Got it, thanks'
So, I figured out a method that works for me. If there is a better way, say through mysql that would be great. Until then, this is what I did.
Roll the mouse over the image and use the "Alt Text" on the image to pop-up the image name. In this case it was 'river 7/12b'. It is also displayed in the Browser Title Bar using IE. Didn't test it with FF.
Using SSH I logged into the server and navigated to the gallery/files folder.
Then I ran
find -name river*
It returned several results but enough information to locate the files I am looking for.
Normally I would imagine you could use the full filename but in this case the '/' will cause a problem so I just used the wildcard to get around that.
Anyway, thats my method.