My work gives out a parking pass to staff, which is a sticker on the windshield. Once I traded cars with a friend because of gas mileage for a long trip, and forgot their car doesn’t have the parking pass. So I got a fine for parking at work. Just a chat with management cleared it up but I could imagine a similar situation

Maybe he just parked in the wrong space. Where I work, parking is free, but I can’t just do it anywhere.