They do not! If they "think" they do they are incorrect!

MB did offer a factory option of a refrigerators, I have both seen one installed in a 126 chassis vehicle and researched the VIN data card of that vehicle which listed the option, it was code # 307 Cooling box in luggage compartment, and incidentally it also had a webasto heater, mileage computer, rear shades, SLS on all four wheels!

The unit in the picture is option code # 308 Cooling compartment in center rear backrest which in this case appears to have been installed into its present position. Who installed it there and when remains unknown but the pieces and parts are official MB factory option!