It would be quite unusual for a car to not have primer at all. The main floor section and rear was done using automated spray jets as the car passed over. We have seen where some cars show a pattern on one of the spray nozzles not having sprayed.
Keep cleaning around, something might turn up.
Also, you might not have caught it earlier, but the front frame rails, from a line straight down from the edge of the cowl, backwards of the car was done with automation, but the front was hand sprayed. The reason is obvious when you think about it. They wouldn't want the middle jets spraying through the engine bay and hitting nothing.