ooooo the siren could be a good way to go...
wouldnt be hard to setup a little booby trap so when the box lid is opened it pulls a pin out from between 2 contacts which then complete the circuit and set off the siren...
there are even little self defense sirens that are pretty small and really loud, i'm sure one of those could be modified to fit your needs.... any way you set it up you want it to be hard to turn off...
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-=JStrider=-
~Clatto Verata Nicto
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