Maybe I've missed something, but I can't see why a special script would be necessary in this case.

[ ... ]
This script is not special for the situation in question.  In contrast,
it is meant to be run after every backup to produce tape-labels with
information which files from which tapes you need to recover a given
DLE.  You attach those labels to the tapes and you always have an answer
to OP's question, even if you loose the database.

Why not use the commands already provided as part of the amanda
distribution? I mean, like

amadmin <config name> find

or

amadmin <config name> find <host name>

or

amadmin <config name> find <host name> <disk name>

Maybe because the output of "amadmin <xx> find" is no more than a plain

dump of amanda's database.

Please go and check the above mentioned script and compare its output
with the output of "amadmin <xx> find".

- Toralf