>>Why is TSM attempting to use this tape for reclamation when it has been
labeled as "vault" and is "offsite"?<<

Its not.  TSM is trying to using the primary pool version of the data to 
recreated the copy pool version of the data and is unable to do so because it 
is not for some reason able to read the primary pool version of the data.  
Check to see if you have any primary pool tapes that are UNAVAILABLE (q vol 
access=unavail) or whether the primary pool tapes are being used by other 
processes when the reclaim is running.

David Ehresman
University of Louisville