Where do /root/.bashrc and /root/.profile come from on a Debian system?

Normally when you add a user on a Debian system, the contents of /etc/skel/ are copied into the new user's home directory. But /root/.bashrc does not match /etc/skel/.bashrc and /root/.profile does not match /etc/skel/.profile. Also neither file is known to dpkg. So where do they come from?