postmaster pre-filter: search in tickets

Peter Tester <[email protected]>
Newsgroups gmane.comp.otrs.devel,gmane.comp.otrs.user
Message-ID <[email protected]> 
I wrote an postmaster pre-filter that searches in the tickets for an existing external ID, if it's existing a new article to this ticket is added. Otherwise a new ticket is added.
My problem is that I have to define the Agent ID (UserID) in the Ticketsearch function in the pre-filter. 
How can I handle searches in all tickets and not only supportef by the selected agent?

Thank you

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