This is a common scam for stealing cars... Get car rental returns to be misdirected to a nearby lot, for example by turning around a sign, taking a few cars over a few hours, and then vanishing.
The people doing the returns often don't even know their doing anything criminal. They're normally hired from craigslist and asked to wear a yellow vest and put up a few "Hertz car return area" signs, then take return of a bunch of cars, while a car transporter is hired to pick up all the cars and take them to a port to leave the country. The whole lot is organised by the mastermind by phone, who is probably located in a foreign country and is using a VoIP number to be nearly untraceable.