According to its developers, FuryBSD was created to facilitate the installation of FreeBSD on desktops / laptops. With this in mind, I would not be surprised if it wasn't possible to distinguish between them. However, you could try: grep -rli furybsd /etc/* and also on /usr/local/etc/*.
If you don't find anything suitable in there, you will certainly find something under /usr/local/share - at least the FuryBSD logo...