1)
Why did they speak with the man at the entrance of the house?
1.
Rashi: Refer to 43:24:1:1.
2.
Oznayim la'Torah: In case he would libel them and they would need to fight for their freedom or to escape, which would have been difficult once they were inside the house.
3.
Malbim: They did not want to enter the house before returning the money, so there can be no claim against them.