This package works by using dpkg-diversions -- it renames the original files and then provides a replacement branded one.

If you want to add new files, you must update the preinst and postrm scripts, and add the file path there.  To get a list quickly and easily, do:
 find branding -type f | awk '{sub(/branding\//,"");print}'

We cannot do this within the maintainer scripts because those files aren't around at preinst and postrm time.
