When we moved into the house I was 7.5 months pregnant and the first day there were 2 redbacks in the lounge and heaps in the garden bed bricking...freaked the hell outta me too!!

I doubt thatyou will have one in the car though...if the other one came out of the carseat box or was it just in the shop?? As far as I can remember Redbacks arent social spiders (like huntsmans) they live/travel alone, so chances are there wont be another one.