That is where I'm currently at right now, just haven't had the time to sit down and look at this some since. They should be located inside the maps folder, and bear the same name as the relevant map file. However, I'm guessing that it's not working correctly given that I'm not able to connect to the server locally, but I'm unable to confirm anything until I can get some console data or any sort of helpful log.
Now that youve made it this far, you are ready to play GoldenEye: Source If you encounter any issues, check Client Troubleshooting. I did attempt to follow their guide and install the GoldenEye: Source on a Linux machine, but as of right now I haven't been able to confirm whether it actually fully works or not because I'm unable to see any console output due to the way they have you install the game in Linux. For GoldenEye: Source to appear in your games library, Steam must be restarted after the installation is completed. However, I was able to get ahold of someone on the GolenEye: Source team and they said 'We've stopped supporting the Linux build natively and wrote a guide on how to run the Windows server under Wine. I apologize for not leaving any updates for this in a while, I've been out of my state for a few days and have been very busy with more important life matters that came up.