I am a newbie, and no way under the sun am I going to leave my bike OUTSIDE all night. Bringing the bike inside should have been the ONLY option. Take that as a warning and count yourself as being lucky.
A lot of things could have happened behind leaving your bike an easy target for theives. What do you think would have happened if you came down and suprised the theif???
I am an older gent, and througout the length of my years, I have found out that this phrase is nothing but the truth. "A Hint To The Wise Is Sufficient"..
Luck to you,