All reports of boolean-template-has-bogus-default for the archive. The extended description of this tag is:
The "boolean" type in a debconf template, can have only two values: true and false. The default has been set to something different.
Refer to Configuration management section 3.1 (Template information) and the debconf-devel(7) manual page for details.
This tag has not been emitted in any package tested by Lintian.