/usr/share/applications/screensavers/boxfit.desktop is in xscreensaver-data-extra 5.15-3ubuntu1.
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 8 9 10 | [Desktop Entry]
Name=BoxFit
Exec=/usr/lib/xscreensaver/boxfit -root
TryExec=/usr/lib/xscreensaver/boxfit
Comment=Packs the screen with growing squares or circles, colored according to a horizontal or vertical gradient, or according to the colors of the desktop or a loaded image file. The objects grow until they touch, then stop. When the screen is full, they shrink away and the process restarts. Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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