I'm not sure what your point is. Are you saying that they expect the customs agents to announce what's found in their luggage?
Naw, Fed Agents typically don't leak to the press on celeb stuff. Figure there's a civilian employee who sees the thing go down. He calls the local reporter, and the reporter calls the Feds, "Hey, I heard you just busted Rush..."
There's an entire economy based on celebrities...reporters regularly pay low level people for information on celebs. Fer instance, if you work for a nightclub and convince some A level celeb to show up and get their pic taken, it's worth a thousand bucks. Celebs, particularly rap stars, know this and leverage it.