+1. He was a suspect. Things didn't check out and the cops let him off without even taking him to the station.

So now whether they had the probable cause to search his computer or not - that is unclear as we obv don't have a full story from the law enforcement side of things. I highly doubt that someone calling the cops and telling them - 'someone on craigslist is selling a laptop that was stolen from me' without any proof would trigger this ordeal.