They can, and will, search your car to see if you may have tried to smuggle something else. They can charge you with a whole lot of things. They can make your life miserable. They can add you to their watch-list.
Styrak, if they want to they can do pretty much what they want. Feel free to ask an actual border guard (off the record) about what they can do. I have.
Seen it too.
BTW they dont have to put your car back together after they search it.
Anyway, it's really his choice to try and find out who'se right. I'm just pointing out what can happen.