I don't know of a way to tell if it's been changed, without disassembling the timing covers, etc, at which point you might as well install a new belt.
Most people change the belt at 100,000 miles or more, so if I were you, I would assume it has not been changed.
Most people change the belt at 100,000 miles or more, so if I were you, I would assume it has not been changed.