/usr/share/dbus-1/services/org.gnome.Boxes.SearchProvider.service is in gnome-boxes 3.18.1-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [D-BUS Service]
Name=org.gnome.Boxes.SearchProvider
Exec=/usr/lib/gnome-boxes/gnome-boxes-search-provider
|