First I would like to say that my heart goes out to you. Whoever stole your plant is trash, and will eventually run afoul of those who will teach them the error of their ways in a satisfactory manner. Now, maybe I have spent too much time reading Sun Tzu's the Art of War, but certain parts have always stuck with me, and apply very accurately to situations like this. Sun Tzu says that all conflict is based on deception. When you are strong, you must appear weak. When you are weak, you must appear strong. When you are unable to attack, you must seem ready to strike. When ready to strike, you must seem defenseless. He also said that the best way to win a war is without shedding a single drop of blood. If you can defeat your opponent with psychological warfare, things never need to come to violence. Maybe I take that advice too seriously, and maybe I spend too much time pretending I am Liam Neeson from Taken. That being said... In addition to the camera I would leave a note in case they come back that says "To those concerned: You have taken property that does not belong to you. This was a mistake. You have muddied your boots in waters that are too deep for you. You have one chance to correct your lapse in judgment. You have one week to return what you have taken. That is all. Smile for the cameras on the way out. We will be watching." and if you have any hunter friends that can loan you a large caliber rifle round to act as a paper weight it would really put a stamp on things.