/etc/group question

I have a server box with the following files:

/etc/passwd
foo:x:1000:1000::/home/foo:/bin/bash
bar:x:1001:1001::/home/bar:/bin/bash

/etc/group
foo:x:1000:
bar:!:1001:foo

/etc/shadow
foo:[ENCRYPTED_PASSWORD]:14010:0:99999:7:::
bar:[ENCRYPTED_PASSWORD]:14055:0:99999:7:::

Now the question is, what commands could the sys admin have possibly
issued to end up with that last line in /etc/group with an exclamation
point in the password field? I'm have a seriously hard time figuring
that out. I'm trying to set up another server box with exactly the
same user setup, but I don't want to copy the files, I want to know
what commands were used to generate them.

Thanks in advance,
--Jonas Galvez
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