4 ounces of C-4, a proximity switch/sensor and a one minute timer.
Once the package leaves the immediate area of the proximity sensor the timer starts.
A minute gives the thief time to get into their vehicle, but not enough time to get going very far or fast.
Boom. One less thief, and a very loud warning to those perhaps tempted to do the same.
“Pour encouragere les autres”...
Saw a recent NCIS episode with a cold opening like that.
For the DIY impaired:
Invisible fence used to keep dogs on property. Sensor would be the one contained the respective dog collar that comes with the kit. Enough amps to set off a blasting cap.