Not completely applicable to this thread, but a good story, I think...
We have a bunch of tulips in our front yard. In the spring time - right about now, actually - the yard is filled with literally hundreds of tulips.
One spring, two years ago, I noticed that starting in one corner of our property, someone was cutting the flowers and taking them. It started with 1 or 2... and within about about a week, there was a good solid dozen of them gone.
I was a bit annoyed. So I set up a web cam, set it to record movement and waited. I was going to get their picture and see what time of day they were doing it and figure out who it was an then do some irate knocking on their door.
It took less than a day and I found the culprit - a 5 year old girl who lived about five houses away.
I thought about it for a bit, and then decided not to do anything about it.
She didn't take any last year, and they are still all intact this year as well.