I tend to find new marks appearing from time to time and often thought it was someone walking through the driveway. Most likely a jacket / bag that has just skimmed across the car, just enough to leave a mark. Possibly a delivery though as neighbours and visitors know that the car's special
Although, I've found a few more deeper marks and chips - almost certain they're from my neighbours building work though.
Currently, the car gets washed and then covered, on the weekends the cover would come off so it can breathe,