Kommentar zu Bereschit 42:25

AND TO GIVE THEM PROVISION FOR THE WAY. The reason for saying this is so that they should not consume the food which they bought in the course of the journey. He informed them of this for he gave them the provisions for the journey in a kindly fashion so that they should be able to bring the brother [Benjamin] to him, for he said, “I have no intention of harming you if your words are verified.”

ולהשיב את כספיהם, and to restore their money. The plural mode in the word does not apply to the collective term כסף, money, but to the coins which together made up the money.

ולהשיב כספיהם, and to give back their money. The reason that this verse does not employ the syntax that is commensurate with the first half, i.e. וימלאו, or למלאות…ולהשיב, could be that the person who filled the sacks was unaware of the fact that someone else had returned the money. The person who put back the money was Joseph's most trusted servant. It is also possible that Joseph ordered that the filling of the brothers' sacks with grain was to be done publicly, whereas the return of their money was to be accomplished secretly after the sacks had already been filled with grain. The reason Joseph did not give both instructions simultaneously was so as not to arouse the envy of the person entrusted with filling the sacks with grain.