Hmm. I asked in gnu.emacs.gnus and no one replied. Maybe someone here
will know.

Is there a way to move ticked-and-cached (!*) articles from one NNTP
group to another?

This issue comes up when you read a group from one NNTP server, then
switch to another. Or when you read a list via Gmane but then start
subscribing it via E-mail. You will probably want to move all the cached
good stuff to the other group. Can this be done?

--J.