Another trick you can try is to place a notify (I know this works with mIRC) on one or more of the "regs" from that chan. So when they login you are sent a notification that "reg user" just signed in. Then just ask them what the new chan is.
This usually works quickest when you set a notify on the chan bots, course they won't answer but you can do a /whois to find out what chans they are maintaining.
Good luck,
Weapon X
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