How can a dealer ship put 1500 miles on an odometer in under 8 hours?

Often when an advisor at a BMW dealership writes up the car repair order they take the mileage of the key reader data and not the actual mileage off your dash. Ask them for a copy of the key reader data print out. It will say on the top right side of the report "Key last updated.." with a date and time. If the key data was old the date should be further back then the day you took the car in for service. Did you give them the same key that you drove the car in for service or did you give them the other key? They key only updates when in use. If you have another key or a key used by another driver that wasn't used last the information in the key would be old and outdated. I wouldn't be surprised if the advisor didn't check to make sure it was correct. I promise you they did not tamper with your mileage. The odometer has a tamper indicator which is a dot on the odometer. You car has redundant systems that stores the mileage where if one is changed the other will override and show a tamper indicator. I'm sure it was just an honest mistake.