[talkingcars]

I'd get a second set of lockers, note that most tuner bolts only have one version of locker so you'll need to make sure it is truly different.

Then I'd leave a couple of notes saying that the lockers are not with the car, say in the boot and glove box.

Finally I'd get a stand alone alarm such as a shed alarm which will go off if the car is opened, or maybe a tilt sensor one, they are only a few quid on ebay.