The best solution to know everything about your car.
In Europe, many used cars are sold without bills and without the maintenance book.
According to the statistics, 60% of cars in Europe has a false mileage 100000 km and more !
The car can be in very good cosmetic condition with a low mileage, but without the supporting evidence, you can't be sure, and even more serious, you can stumbled upon a car that comes from Germany or Romania, with the mileage dropped a good.
Before you buy a car without proof, think twice, you can always ask the seller to order a report with the history and the record of mileage for the insured your purchase.