Sunil,
Be careful with the camera idea. When the flash goes off it is a dead giveaway.. so the thief not only takes the evidence but gets a $200-$300 camera also. The chains or straps used to secure the camera to a tree or post are like all locks...They only keep honest people honest.
You might see if there is anyway to use existing light that would enable you to disable the flash so you would not alert the thief that he has been recorded on film. You gotta think like a thief to catch one............
Good luck.
Dan
