Every story gets a number. It's unique to that story.
These numbers are handy to communicate the story. (compacter than titles)
I can't seem to find the story if I have the number.
The only way I have found so far is the Adress Bar of the browser.
The search bar in Management → Stories would be a nice place to search for them.
Actually, sorry. The URL bar does not work. It's a fake URL and the system appears to not know how to handle it.