My sister got audited for not claiming enough tips.
Ask your employer.
The government knows that certain jobs generally receive tips. Car Valet is likely going to be on this. They have an amount they expect to see.
So you need to talk to your boss and see if he sends in tax information for tips. If he doesn't, you're probably ok. If he does, you need to start assuming you'll owe money.
That being said, if it's a shady business, the entire company could end up getting audited leaving you screwed as well.
Usually it's likely ok to report less than what you actually get because the "expected" numbers are typically pretty low. But if your job describes you as a valet, you should be reporting something.
My sister got audited and ended up owing $800 I believe, so it does happen for small amounts.