A friend of mine started and released her own camera a couple weeks ago. She left it in the "Beers of the World" section of the Pittsford Wegmans while making her first 6-pack purchase as a legal adult.
The number was chosen because the camera was released on 8/18, my friend's 21st birthday.
Good luck #21818!
Edit: I forgot (months later I remembered) that I took this picture of camera #21818's release: