Genesis 43:18

The men were afraid. Joseph’s brothers were more deeply alarmed than ever upon discovering that they were to be taken to Joseph’s house. They may not have understood Joseph’s order, which had been given in Egyptian, and when they arrived at his official residence and were bidden to enter, they expected to be put into slavery, under indictment for theft. In an effort to avert what they feared, they approached the steward at the door, explaining how they had found the money in their sacks and that they were prepared to repay it. There is no need to assume a discrepancy between the record of the occurrence as given in ch. 42:27, 28 and as repeated here. It is possible that all had opened their sacks at the “inn,” but that only one had discovered his money at that time.

It is inconceivable that the entire group had taken back only ten sacks of grain to feed their animals and their families for a period of several months.