The spies would have been familiar with the place, since they had previously lodged there on their initial quest for land. So they would be able to slip into the house and know exactly where to go in order to locate and steal the idols, the ephod, and the household gods.
17 And the five men who had gone to scout out the land went up and entered and took the carved image, the ephod, the household gods, and the metal image, while the priest stood by the entrance of the gate with the 600 men armed with weapons of war.