So I think I accidentally deleted my shortcut presets by a mis click and can't get them back.
I believe I had a custom preset name and I accidentally clicked '-', which immediately deleted my custom presets and set them back to default.
All the keyboard shortcuts I carefully set over the months / years are gone.
I thought I had been saving the shortcuts when I clicked "Save User Settings" in the user preferences file. Unfortunately this does not appear to be the case. I backed up both that file and the startup.blend file. Unfortunately loading startup does not have the shortcuts either.
Am I fated to go through and redefine all the shortcuts again? I suppose everything is a learning experience..