"Smuggling" is probably too strong of a word. "Transport" is probably more like it.
Apparently they have ignored it since it wasn't impounded for evidence. Finding someone who stole a vehicle after the fact is an exercise in futility especially considering a lack of physical evidence, which apparently exists in this case.
Reminds me of the scene in The Big Lebowski when The Dude gets notified that his stolen car was recovered. He goes to the impound to pick it up and acts like it's actually going to be investigated and the cop who releases it to him gets very sarcastic and tells him additional detectives have been assigned to the case.