Look, I don't want to harp on the poor dudes misfortunes so I'll keep it general.
You may think that just because there is no insurance claim to be made here, that there won't be a ramification to insurance premiums as a result...........WRONG!!
Everytime a Skyline (or any import for that matter) gets knocked off, it becomes a statistic and is therefore logged.
Insurance companies adjust premiums to their clientelle 2 fold; (1). $$ spent in claims (2). the ABS website.
Now anyone else on this forum without at least ONE of these items that Andrew has mentioned (ie. Alarm, tracking device, club lock or even a big dog), please don't complain about other members on here having a go about the obvious, especially after reading this thread and then getting your car stolen.
Please note, I have had a car stolen many many years ago and can therefore feel your pain, so this is moreso aimed at anyone who reads this and still does nothing about it......if you can't afford one of these security measures, you can't afford your car.
/rant....sorry to offend