one easy way to tell if a box had been on your truck at one time is to look at the clamp on the boost outlet of the turbo to the actuator. If the clamp is not the original type or shows signs of tampering. To check for injectors look for wrench marks on the line nuts. Of course that could also be that it had to be bled at one time or another. Any Dealer can also run a report to see the warranty repairs that have been performed,also when and where.
Bob