> I might be stating the obvious here but run an 
> nsrck -L6 clientname.
> Then check the index again.

I am re-scanning that tape again, so when it is done, I will try that.

> Has the index directory structure been filled with any meaningful data?

No. There is nothing in the "db6" subfolder under the client index 
directory.

Makes me wonder if my corruption problems over the weekend are more severe 
than I thought ... yet I did other recovers yesterday (from completely 
different clients), and that all worked ...

Keep in mind that this is not a "real" client. There's no machine with 
this name anywhere on my LAN. I created host entries with this name, and 
unused private addresses (I like using 10.254.253.xx, personally). I try 
and always create a host entry and unused address like this, for any 
clients I am retiring, as well as keeping a list of all client IDs, so I 
can re-create the old and now non-existent clients (with slightly 
different names, such as "Old-Client") for doing recovers, like this.