Matthew Poole and continuators on Genesis 43:12

12 And take double money in your hand, and the money that was brought again in the mouth of your sacks: carry it again in your hand, peradventure it was an oversight .

Double to what you carried last, either to procure more corn, which may prevent the frequency of such perillous journies: or because the continuance and increase of the scarcity had advanced the price.

For it is their money, not ours, and therefore must be restored.

Either in you, or in the receiver of your money, who through multitude of buyers and haste in his business might easily be mistaken.