The answer they gave is another bogus one. When was the last time you saw a DOOR JAMB STICKER applied by an oil change place? I see dozens of cars weekly. IF they have ever had a “professional” oil change, the siticker is now found on the upper left corner of the windshield.
It seemed like an overly-easy question, and I had the same thought about the stickers being on the windshield these days.
Also bogus because—who’d bother to get their oil changed and not get the inspection done at the same time?