It's not farfetched to believe a crack-addicted wealthy individual who seemed to live a very "promiscuous" lifestyle, would have forgotten some cheap laptop at a repair shop. These people are humans, at the end of the day.
Yes, it is far-fetched given that the story doesn't add up. Also, cocaine isn't known to cause people to suddenly become poor thinkers. I've seen this narrative pushed multiple times that somehow him doing cocaine made him fly across country and drop off his laptop to a blind computer repair shop owner and leave it there with sensitive information on it which was verified by a blind man with his signature, which was then turned over to Rudy Gulliani because he was concerned about the material.