Thankyou Heitor, it's nearly there (the second one) but it fails if any of the 
tapes are already purged:

Connecting to Director tiger:9101
1000 OK: 102 tiger-dir Version: 7.4.0 (16 January 2016)
Enter a period to cancel a command.
purge volume=001-036

This command can be DANGEROUS!!!

It purges (deletes) all Files from a Job,
JobId, Client or Volume; or it purges (deletes)
all Jobs from a Client or Volume without regard
to retention periods. Normally you should use the
PRUNE command, which respects retention periods.
Automatically selected Catalog: MyCatalog
Using Catalog "MyCatalog"

Volume "001-036" has VolStatus "Purged" and cannot be purged.
The VolStatus must be: Append, Full, Used, or Error to be purged.

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