/usr/share/doc/unburden-home-dir/html/searchbox.html is in unburden-home-dir-doc 0.4.0.1.
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 | <div role="search">
<form id ="rtd-search-form" class="wy-form" action="{{ base_url }}/search.html" method="get">
<input type="text" name="q" placeholder="Search docs" />
</form>
</div>
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