Easy. Same answer as I gave you last time when you wanted to search for
substrings. :)
By default cvs2cl lists its information by "change set", where "change set" is
defined as a bunch of
files checked in at near (and near is controllable) the same time with EXACTLY
the same checkin comment.
Also if you want to use rlog instead of having a checkout, I believe you can
pipe the rlog output
into cvs2cl and tell cvs2cl the log is on stdin.
cvs2cl --help #for all the options
http://www.red-bean.com/cvs2cl/
of course if you want "real" change set numbers you could always use one of
those cvs2svn tools and
then pour through it's output and see if it thinks you had any change sets of
more than one file. :^}
Good luck.