bike lock

I went out to take my bike to go to my job. My bike was locked with another lock besides my locks (I have 2 to prevent it from being taken). What to do...
During the day I figured out that I could call the city ocuncil who has a special bike cleaning service that also removes all the illegally placed bikes at the train station. But since they work only 8-12, I had to call back again the nest day.
When I came back home, the lock was removed. A coincidence? A mistake? A joke? or somthing typically Grunnings?