/usr/share/aat/INC/AAT_CheckBox.inc is in octopussy 1.0.6-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | <% my %arg = @_; %>
<input type="CHECKBOX" name="<%= "$arg{name}" %>" <%= ($arg{selected} ? "checked" : "") %>>
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