Jim:
I'm not an RCS expert, but the rlog, print log info about RCS files, is probably the command you want. I'd read the man pages on rlog, but here's a couple of examples: Assuming your RCS directory is a subdirectory:
RCS -L -R RCS/*
gives you all the files that are locked.
RCS -L -h RCS/*
gives you all the files locked with just the header info.
Armed with this, you should be able to write a shell script to just get files with your lock.
Let me know if you need some help with this, and I'll help further.
Regards,
Ed