This file is indexed.

/usr/share/gnome-background-properties/greybird.xml is in greybird-gtk-theme 3.22.8-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE wallpapers SYSTEM "gnome-wp-list.dtd">
<wallpapers>
  <wallpaper deleted="false">
    <name>Greybird</name>
    <filename>/usr/share/backgrounds/greybird.svg</filename>
    <options>zoom</options>
    <shade_type>solid</shade_type>
    <pcolor>#000000</pcolor>
    <scolor>#000000</scolor>
  </wallpaper>
</wallpapers>