While the SCOTUS doesn't specifically say that he gave ALL the items back, the NC Supreme Court decision does; from page 3 of the NC Supreme Courts decision: After learning that his drivers' license and registration checked out, Sergeant Darisse returned Vasquez's documents and gave him a warning ticket for the brake light.
http://www.google.com/url?sa=t&rct=j...82001339,d.aWw
When working interdiction giving ALL the documents back is important because it indicates to the citizen that the traffic stop is over. If a citizen engages the officer anymore after that its a totally voluntary encounter...not a seizure.