Questione giuridica chiave
Whether the appellant's right to be heard was violated by use of undisclosed file documents.
Decisione estratta
No violation: the challenged documents were used only to reinforce, not to found, the decisive presumption, and they had no effect on the outcome.
Motivazione estratta
The essential content of the documents had been sufficiently communicated, and because they did not influence the decisive question, any defect was immaterial to the result.