Busted
It seems like people would do anything for free parking and frankly, we don’t really blame them. This OP’s workplace would charge for parking so he would leave his car at the mall nearby but they had a 3-hour parking limit.
When he took his car to the servicing place next door, he realized that they would put a slip on the dash that would allow the car to be parked there for free for the day. He simply photocopied the slip and used it daily for more than a year. Unfortunately, he eventually got caught but hey, at least he saved tons of dollars in the meantime.