Targum zu Bereschit 42:6

And Joseph was ruler over the land; and he knew that his brethren had come to buy; for he had appointed notaries at the gates of the city to register daily, of every one who came, his name and the name of his father; and he it was who sold corn to all the people of the land. And the brethren of Joseph came. And they looked through all the streets, and public places, and hospices, but could not find Him. And they came unto his house, and worshipped him with their faces to the ground.