Starting from v11.1.0, the Kiwi project has integrated this plugin into
the main package upstream.

Commit integrating the plugin: https://github.com/OSInside/kiwi/commit/f9ff796acf4dc8c67a0b912d0032277ff5407066

Kiwi 11.1.0-1 was released to unstable on 2026-09-30.

The upstream source repository now has a deprecation notice indicating
the move:
https://github.com/OSInside/kiwi-boxed-plugin/blob/9649540055210c12558e3b752b298cb7fc9c63b0/README.rst

We believe that the bug you reported is now fixed; the following
package(s) have been removed from unstable:

kiwi-boxed-plugin |   0.2.31-1 | source
python3-kiwi-boxed-plugin |   0.2.31-1 | all

------------------- Reason -------------------
ROM; Plugin has been integrated into the main Kiwi package upstream
----------------------------------------------

Note that the package(s) have simply been removed from the tag
database and may (or may not) still be in the pool; this is not a bug.
The package(s) will be physically removed automatically when no suite
references them (and in the case of source, when no binary references
it).  Please also remember that the changes have been done on the
master archive and will not propagate to any mirrors until the next
dinstall run at the earliest.

Packages are usually not removed from testing by hand. Testing tracks
unstable and will automatically remove packages which were removed
from unstable when removing them from testing causes no dependency
problems. The release team can force a removal from testing if it is
really needed, please contact them if this should be the case.

We try to close bugs which have been reported against this package
automatically. But please check all old bugs, if they were closed
correctly or should have been re-assigned to another package.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1149684@bugs.debian.org.

The full log for this bug can be viewed at https://bugs.debian.org/1149684

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)