A particularly observant person can dissect an entire person’s life and most pertinent information fairly easily. Honor roll bumper sticker on your car? That alone tells me a great deal. ALS charity junk mail in your garbage? Lot there too.
The fact is, privacy is illusory and only made more difficult by our own habits in the 21st Century. We surveil ourselves. Information is everywhere. However, yeah, trying to pick up a date while on the clock is unprofessional and that delivery driver oughta know better.