/etc/xdg/autostart/xfce4-volumed.desktop is in xfce4-volumed 0.2.0-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | [Desktop Entry]
Type=Application
Terminal=false
Name=XFCE Volume Daemon (Pulseaudio)
Comment=Daemon managing the volume multimedia keys and displaying volume notifications for Pulseaudio
Exec=xfce4-volumed
OnlyShowIn=XFCE;
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