John Gill Commentary Genesis 43:21

"and it came to pass, when we came to the lodging-place, that we opened our sacks, and, behold, every man`s money was in the mouth of his sack, our money in full weight: and we have brought it again in our hand." — Genesis 43:21 (ASV)

And it came to pass when we came to the inn
Upon the road, on the first day's journey, to refresh themselves and their cattle:

that we opened our sacks ;
to give provender to our cattle; by which it appears that they all did this, though it is only said of one of them at the inn, and of all of them when they came home, (Genesis 42:27Genesis 42:35) ;

and, behold, [every] man's money [was] in the mouth of his sack, our
money in full weight ;
nothing wanting of it; it being usual in those times to pay money by weight, and not by the tale of pieces:

and we have brought it again in our hand ;
in order to pay it for the corn we have had, having no design to defraud.