Bicycle detail

I left my bicycle unlocked just outside my doors with in my porch and realized it stolen in less than 2-3 hours. I parked it at 6PM, came back to take it inside at 7 PM, but the sprinkler was in action around, so decided to do later. My room mate saw it when he came at 7:45. Then we didn't check till 10. My neighbor didn't see it at 10. So potentially it was stolen in 2 hours timeframe when we were having dinner inside. My room mate had his bike locked and it was intact just near it.