It really doesn’t mean anything if your baby didn’t have any vernix, no it doesn’t mean you were further along than you thought. Overdue babies are less likely to have any as they rebsorb it when they get to term. Mine were both born 9 days late and had basically none on their bodies anywhere except a tiny bit stuck on their hair on top of their heads. They both ended up with dry, flaky skin.
Also, when they’re dried off at birth with a towel, it gets rubbed off. So you’ll never know if it just got rubbed off, or whether it was there.