Pius XII and the Jews

Given the Church's strenuous and confident defence made of Pope Pius XII's war record, is it not strange that the Vatican still will not give unrestricted access to the records? Such an action would clearly be in its best interests.

Or is it that, though the Pope himself acted with clear integrity, there were others in the Vatican at that time who behaved less well, whose actions and words could yet get the Church into trouble?