stolen Kona DEW

I rode my bicycle home after a workout and was too tired to lock it. I live in a third story apartment with little foot traffic, so I didn't think it would be stolen in one night. The next evening after class, I noticed the bike was missing. To be fair, when I bought the bike, I had a suspicion that I was buying a stolen bike. I placed a Craigslist ad in an attempt to reach the original owner and return the bike if it was stolen. I have two other bicycles that were also on the balcony (also unlocked this ONE night) and they were not bothered.