Quote Originally Posted by kraven251 View Post
This is useful if you do not consent to a search and they actually jump through the hoops for the paperwork to legally search your vehicle. You are required to open the trunk, but not required to open a locked box in the trunk unless it is in the paperwork, granted the officer could possibly still have exigent circumstances on their side to open the locked box etc. If a judge signed off on a search warrant on your vehicle, they already had some sort of probable cause other then "the guy said no."

As with the earlier examples, this is only applicable if you don't have anything visible in the car to give additional reasons to think you are up to something shady. Moral of the story, keep your car clean.
This isn't necessarily true. It depends on how the warrant is written and what items of contraband are named in the warrant.