Here is a device that will definitely catch whoever is going through your stuff. It is called the Sneaky Stick and is the size of a stick of chewing gum which makes it easily hidden from the perpetrator.
The Sneaky Stick can capture images, audio and video with a 352 x 288 resolution (don’t expect HD quality of anything near that), plus a time stamp is added to the images and videos so you will know the exact time the incident took place. All the videos, audio and images are stored on the 2GB built-in memory and it can be expanded using a microSD card. The device can be connected via USB to view your content and also charged by the USB. The Sneaky Stick is available at Amazon $38 USD. See another image after the jump