All i ever heard of, like the lads were saying, was rear arches for rust and around the topmounts for dodgy repair work on crash damage, if it has a good service history should be sound, but id do that registration check on the back round of the car as well, i know its a longshot but cossies were very popular getaway cars for bankjobs and that in the 90s, i know its the last thing you think off when buying a car but you never know