The anonymous discorso on justice is basically based on Aristotle, though the text refers to other philosophers such as Plato; an interesting reference to Donato Acciaiuoli as an interpreter of Aristotle is made (f. 116r).
The Trattato de' costumi, attributed to Luigi Dal Portello (who signs the preface letter to Niccolò Valier) by Risse, is in fact the translation of Aristotle's Rhetoric, book II. As one gets from the identity of the publisher, such work might be…