I doubt that it did. Just because the media says something, it doesn't mean there's any truth to it.
Well, that's true enough.
If one agent has specific info, others probably do too.
From ABC News Story:
Editor’s note: This story originally stated that the stolen laptop contained details of the investigation into Hillary Clinton’s use of a private email server, per law enforcement officials. A law enforcement official has since told ABC News that the Secret Service did not investigate Clinton’s emails and there would have been no reason for such information to be on a Secret Service laptop. This story has been updated accordingly.
If I had super sensitive stuff, I would never leave it in a parked car while I slept somewhere else. If this is true it is very sloppy.