/usr/share/xfce4/panel/plugins/pulseaudio.desktop is in xfce4-pulseaudio-plugin 0.2.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Type=X-XFCE-PanelPlugin
Encoding=UTF-8
Name=PulseAudio Plugin
Comment=Adjust the audio volume of the PulseAudio sound system
Icon=xfce4-pulseaudio-plugin
X-XFCE-Module=pulseaudio-plugin
X-XFCE-Internal=FALSE
X-XFCE-API=2.0
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