Finding paths to javascript themes or files will not work if they are cached.
You, as well as the license, could find CHANGELOG.txt, UPGRADE.txt or MAINTAINERS.txt in the root directory.
Depending on how the server is configured, you can also request a path that is denied access in .htaccess.
If you gain access, and not a page not found on all of these templates, it will most likely be Drupal. These paths are (add network root): module, profile, themes, etc. See .htaccess File for Drupal. If the page is not found for these pages, it could be Drupal.
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