Try searching for "panel" (I'm in 5.5 Brigantia):
~ $ find . -name "*panel*" ./.local/share/applications/gnome-printers-panel.desktop ./.local/share/applications/deja-dup-ccpanel.desktop ./.gnome2/panel2.d ./.config/gnome-panel ./.gconf/desktop/ibus/panel ./.gconf/apps/gedit-2/preferences/ui/bottom_panel ./.gconf/apps/panel3-applets ./.gconf/apps/gnome-settings/gnome-panel ./.gconf/apps/nautilus/sidebar_panels ./.gconf/apps/panel ./.gconf/apps/panel/toplevels/panel_2
