A sufficiently locked bootloader and a maybe even a disposable battery will reduce the effective finder's value to a few grams of rare earth magnets. At this size, I would not expect too many fancy area-51-grade sensors, just OTS webcam class stuff that gets the job done.

With the massed deployment model of dropping a whole container of these things, the nominal cost woult probably be measured in money per tonne, not money per airframe...