How to recover a lost LaunchPad configuration?

I recently sent my Macbook Pro in for a repair, and I noticed upon receiving it that my Launchpad configuration has been lost. I spent quite a lot of time putting it together, and can't seem to recover it. I backed up my computer before I sent it off, so I tried using Time Machine to recover the Dock folder under Library > Application Support > Dock, to no avail. LaunchPad isn't reverting back.

Is there a file or folder that I am missing that holds the Launchpad config?

Thanks!