They drove my car while I was away. The first time I suspected it but wasn't 100% sure. The second time I wrote down the mileage before I left it. The seats, mirrors, even the radio were all readjusted as well. If you are going to use this place, write your mileage on an index card and leave it on the dash so that they know you know what it is.
Expect the pickup to take 30-60 minutes. The van is plain black with almost no lettering, so it is very hard to see. The name on it may not be "the Park". It would help immensely if they put some kind of bright logo on their vans.
They used to be the cheapest but have gotten much more expensive over the past year - I no longer think they are worth the issues above.