VIN Number location

I've looked everywhere on the car where everyone has suggested and either the vin is buried in paint or it isn't there. I looked at a couple of cars at P-Town Good Guys yesterday day and they didn't have any stamping. One fellow was nice enough to take up his trunk rubber seal to look for the vin number and his trunk isn't stamped. I looked at several car in the sale lot and they didn't appear to be stamped either.