First, you need to have a plan. What are the specific reasons why the inventory is not clear. Be specific. Can not say that the car processing side is inconsistent even if. Specifically what is consistent and what is not.
Then, go to the boss. Talk to him about the specifics. Then say what you think, is to tell him the problem of your opinion. In fact, it is very simple, encountered this situation directly with the boss to ask the real disk on the line. Less part of the disk loss can be. And it's not you who lost it. You just need to do your job is good.
Finally, the boss either agrees or disagrees. Agree that you will be real disk, do not agree to see what the boss means. If it continues to hold you accountable then there's no point. Consider changing jobs. This boss can't