The formula evoking Pirandello sounds forced. The writer of a different online article in which a similar construction appeared also seemed wary of this possibility and avoided it thus: "Trecentosessantasettemila euro in cerca d'autore o...per meglio dire....in cerca di “liquidatore”. Il “liquidatore” in questione lo stanno cercando, da quanto ci risulta, i dipendenti comunali, componenti della commissione che..."
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However in this case even this approach doesn't work IMHO ("11.3 billion euros in search of an author... or rather, in search of ways to save that amount from the budgets of politicians, administrators, bureaucrats, doctors and pharmacists." - the problem is that the 11.3 billion euros should be the OBJECT of this search, not the subject, as this construction unfortunately requires).
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Given the above, and also as (I assume) Pirandello does not seem to have any particular resonance with health economics per se, especially for an English-speaking audience, I would suggest a different approach altogether, something like the following:
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"Wanted: 1.3 billion euros. Last seen being used inefficiently in the hands of politicians, administrators, bureaucrats, doctors and pharmacists."
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So that last bit's my actual answer. Please excuse the prolixity. HTH anyway :)