/usr/share/gnome-shell/search-providers/gnome-boxes-search-provider.ini is in gnome-boxes 3.28.1-1.
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 | [Shell Search Provider]
DesktopId=org.gnome.Boxes.desktop
BusName=org.gnome.Boxes.SearchProvider
ObjectPath=/org/gnome/Boxes/SearchProvider
Version=2
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