I had once found 7 dead mice in the shoe boxes. One box even had shoe. It was in terrible condition. I had to through out all the mice.
Recently Around 8-10 mouse invaded my house through ventilator. The came from drainage pipes. That night i put some bait and poison. They did not come again after that but they had filled mud in the drainage pipe. I had to get those pipes cleaned. It cost me about 20$ to get that work done.