My mom had a similar incident the other day. She just moved into her new house, and came home to find an SUV parked in her driveway. So she looks around, and thinks maybe its some of the construction workers, as several houses down the street from her are in the process of being built. So she sits for a minute, and then sees a woman with a clipboard walking down towards her driveway. She motions for the woman to come over, and the woman said, can i help you? Mom said, why are you parked in MY driveway??? The woman said, Oh, Oh, i'm so sorry, i didn't think the house was occupied, etc. Um, there is stuff on the front porch, etc. so not sure why she thought that.
She then said, well, what can i do, and mom, being frustrated, said you can get your blank car out of my driveway!!! Turned out it was the tax assessor!!!! had it been me, i woudl have parked at the end, blocking her in, but mom is in a wheelchair, so that wasn't possible. She was NOT happy though, and I don't blame her. And...there was plenty of parking ON THE STREET a little further down.