Re: Joining sentences using V-ing
I'd like to point out that this a not a very gracious way to express appreciation for someone who tried to help you.
Originally Posted by vkhu
I don't find much difference in real meaning in the two sentences.
Finding ..., he left -- seems to emphasize the two actions. He looked, he found no one, he left.
Having found..., he left -- seems to emphasize the "state" he was in; it's about him. It's quite clear that the reason he left was because no one was home. It also feels like this has been pushed a little further into the past.
But really, I wouldn't feel it was unusual if you used one instead of the other.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.