How to detect files not yet checked out in CVS ????

[Bitter Spock]

Suppose I have a CVS module called "bin"
and in it I have several scripts.

If I checkout in my local area "bin/script_a" and "bin/script_b"
there are now many other scripts in "bin" which I have not checked out
locally
But if I do:

cvs update
cvs update -dAC
cvs co bin
etc...

I can't seem to update the directory with the other files, if I have a
partial
checkout.

I am trying to merely detect their existence i.e. "cvs -n update" to
use
in a PERL script I am writing.

The closest I came was "cd /tmp/; cvs export -D now bin"

Apparently I can't do "cvs -n export -D now bin" to do a dry run. It
forces me to do the actual export.

:-(

Anybody know how to detect this ???