It helps, of course, if you make it obvious so they don't have as much work to track you down... engraving your name/phone with an electric pencil or vibratory etcher is a start.

But in the end, if they lucked onto a nice gadget and peripherals, laziness might not be the only thing between them and the Abe Lincoln course of action.

Maybe something like this on one of the MMCs (for when it's connected to a Windows PC), and a custom splash-screen on boot, would go a way towards that...