Weird aftermarket alarm sensor in boot

Technical Area Electrics & ICE
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  1. My model of MX-5 is : MK2
  2. I’m based near: Ireland
  3. I’m looking for technical help or recommendations on: This

So i’ve had this loose cable in my boot since i got the car back in september and it’s been driving me nuts, i eventually got round to cleaning the whole boot (well overdue it’s manky in here) and i finally found what it’s off. This out of place looking boot sensor.

I take it this is off the stupid aftermarket alarm i want to rip out under the bonnet? Going by the self tapping screws and rust around all the holes made, it really stands out. It’s been disconnected since i got it so i’m not worried about the alarm suddenly working upon removal, but have any of you guys seen this before?

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Yeah, I’ve got one, my door used to lock/unlock and the alarm set/unset via the keyfob, then one day for no reason the alarm still works but not the lock/unlock via the key fob stopped working. I had always thought the boot wasn’t connected to the alarm system, then a few weeks ago heard my alarm going off - I’d not closed the boot properly and the wind had caught and lifted open the boot lid and set the alarm off -reason I thought it wasn’t alarmed is as I’ve had the boot opened a few times before when the alarm was set, but only for a minute or two, so might be a delay of some sort on the boot alarm?