This file is indexed.

/usr/share/xscreensaver/config/boxfit.xml is in xscreensaver-data-extra 5.15-2ubuntu1.

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="ISO-8859-1"?>

<screensaver name="boxfit" _label="BoxFit">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="20000"
          convert="invert"/>

  <hgroup>
   <number id="count" type="spinbutton" arg="-count %"
           _label="Boxes" low="1" high="1000" default="50"/>

   <number id="growby" type="spinbutton" arg="-growby %"
           _label="Grow by" low="1" high="10" default="1"/>
  </hgroup>

  <hgroup>
   <number id="spacing" type="spinbutton" arg="-spacing %"
           _label="Spacing" low="1" high="10" default="1"/>

   <number id="border" type="spinbutton" arg="-border %"
           _label="Border" low="1" high="10" default="1"/>
  </hgroup>

  <hgroup>
   <select id="mode">
     <option id="random"  _label="Boxes or circles"/>
     <option id="boxes"   _label="Boxes only"   arg-set="-mode squares"/>
     <option id="circles" _label="Circles only" arg-set="-mode circles"/>
   </select>

   <select id="mode2">
     <option id="gradient" _label="Color gradient"/>
     <option id="image"    _label="Grab images" arg-set="-grab"/>
   </select>
  </hgroup>

  <xscreensaver-image />

  <boolean id="peek" _label="Peek at underlying images" arg-set="-peek"/>

  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <_description>
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; 2005.
  </_description>
</screensaver>