The context of the following conversation is Carson had been looking for their things for ages. Cameron found them and gave Carson their things back.:
Carson says Cameron found the things I've been looking for, for ages.  He gave them back to me..
The friend responds What things?.
Carson responds They were a bunch of notebooks that I wanted to keep.  I thought I had thrown them out when I moved..
The friend responds That's nice of Carson to give them back to you..
Carson responds He's a swell guy.  I told him I'll treat him to dinner..
The friend responds He deserves it for finding your things..