You could send a message out to the unmoderated list, but a better way to see is by retrieving a list of all of the list members and browsing the list for the person's name. To retrieve a list of all brothers and sisters subscribed to the list, send a an e-mail to LISTSERV@listserv.muohio.edu with the following in the body of the email:
Review KKYTBS
You may also substitute KKYTBS with KKYTBS-L, depending on which list you want to query. This gives you all the options and everyone subscribed.