here is my 2 cents on this issue...
ive heard everyone say "use tamperproof screws/torx screws, bolt the box to the floor blah blah blah blah"
none of this is going to stop them completely...a simple flathead screw would be just as good as a torx, just because the simple fact its a pain in the rear to take out any type of flathead screw.....i know you've all tried it before......you start turning the screw driver and it slips off the head? yea you know what im talking about....
a torx screw is like using a philips screw....too easy.....
bolting the box down wont help one bit if they have a nice and hefty hammer, if they made enough noise to get into the vehicle a hammer smashing open a box isnt going to hurt them any
anyone knows an alarm will help you out.....but why spend all that money on a real alarm when you can put a simple LED some place on the dash or some place it can be seen? looks like you've got an alarm....but do you really? i thought about this idea in my 2000 sport....which has the blinking "theft" light, i would think just simply grounding the LED and hooking it up to that would make it blink at the same rate....you're call......and as i said.....this is just my 2 cents
You are right about torx, but you can mix the screws, if you put some flat, some torx, and some phillips that will be a PITA to take out.
Most of car theft won't have a hefty hammer, and you can always use chain and look, i have my box chained to my rear seat

, an my amps are just under my box, so they can't take out box nor my amps. And my box fits under the cargo area cover this way my eX looks stock.
About the LED of the alarm that won't stop a theft, cause most of your alarms brain are under your dash driver side, they now that and as soon as they open your car they will smash the brain of your alarm and that's it.
In my case i have a fake brain of an older alarm under dash driver side, and my real alarm is hided on the passenger side all wires are black, cover with 3M tape, wire loom, and more tape, they can not be cut. I have a backup battery for the alarm in case the can reach my car battery, that way the alarm won't go off.
And put as much sirens as you can, i have 2 multitones in front, under the hood, 6 piezo siren inside the cabin, is really annoying to be inside my truck when alarm is trigged.
And since i put wheels to my truck i'll install 4 more sirens over each wheel that way if they try to steal the wheels they will have to deal with a 125dB siren near their ear, plus all the noise it makes from the other sirens.
Another tip is to put some lights like cop lights that flash when alarm is trigger that way it will call the attention of people around, cause people won't stop if they hear your sirens, but they'll definitely look if they see some flashing lights