How to recognize an EX-carsharing vehicle

Two weeks ago I bought a Ford Fiesta from a Ford dealer from the district of Offenbach/Main (MK7, EZ 11.2014, 6.5tkm). The vehicle was registered with this Ford dealer from 11.2014 until 01.12.2015. I bought the car at a comparable very good price with absolutely desired equipment. The car received a Dekra-HU and an inspection with oil change before the delivery. Visually, the car had no traces of use. During the sales interview the car was presented to me orally as a demonstration car. In the written purchase contract no reference to a previous use as a rental car or taxi. So far everything is great. But now I have seen by chance on the Internet that this dealer offers Ford Car-Sharing. Now I have concerns that I have here due to the low annual running performance and the outrageously favorable price (approx. 1.000 to 1,500 Euro less than the average market price), an ex-car sharing vehicle was undercrowded. Can someone please tell me how to recognize an ex-car sharing vehicle? Thank you.