וַיֹּ֤אמֶר יוֹסֵף֙ הָב֣וּ מִקְנֵיכֶ֔ם וְאֶתְּנָ֥ה לָכֶ֖ם בְּמִקְנֵיכֶ֑ם אִם־אָפֵ֖ס כָּֽסֶף׃
E Giuseppe disse: Date il vostro bestiame, e vi darò in cambio del vostro bestiame, se non v’è più argento.
Haamek Davar on Genesis
If there is no more money. He did not believe them, so he told them to bring their livestock as a test, knowing they would rather part with money than their animals.