There's no key with it, but there is a thing that looks like this (courtesy of MS Paint):
It fits into the keyway, but obviously doesn't unlock the lock. It sort of works to lift all the levers into place so the bolt can retract. There's a hole in the lock that lets you see the gate locations on the levers. This hole would not be visible when the lock is installed, of course. The oval shape in the middle of it is an indentation.
Anyone know what this thing is called and what it's for? I don't even know if it's supposed to be with the lock or not.
Hopefully I can post an actual picture sometime, maybe of the lock as well.