I agree with the above. It will slow the thief down. Having said that when I had my Boxster I had wheel locks on(factory made likely) and when I last changed the summer rims to the winter ones I ended up damaging one wheel lock to the point where I could not get the lock off. I took it to my indy shop and he managed to remove the damaged wheel lock and I told him to put all regular wheel nuts on. I was that exasperated.
If I was in a sketchy area or had no garage then I would put wheel locks on. An extreme measure would be to spray the rims a wild orange, lime green or pink color as an additional deterrent. After all it is a Toyota.
