The NICB warns that even if you didn't know you bought a stolen vehicle, it can be confiscated and returned to its original owner. To help avoid buying a stolen vehicle, NICB recommends that you:

Contact your state's motor vehicle department to check the Vehicle Identification Number (VIN).
Run a title search on the vehicle.
Ask your insurance company if they can inspect the vehicle before you buy.
Be wary of buying a car from anyone you don't know who is using a cell phone for contact, especially from online ads
Walk away if you don't trust the seller and something doesn’t feel right

Stolen car parts, from catalytic converters to bumpers, doors, wheels and hoods are also on the rise, says the NICB. To avoid unknowingly having stolen parts installed on your vehicle, the NICB suggests:

Using repair shops with Automotive Service Excellence (ASE) certified technicians.
Getting shop recommendations from friends, family or your insurance provider.
Asking for a written warranty for installed parts and completed paint work.