I would never underestimate the Revenue man and I wouldn't be surprised if there was one as a Member. If you try and take the michael and get caught out you'll most likely pay for it harshly and once they start looking at you, you're stuffed. They'll know it's a sexdoll if they open the case and examine it and if you've been too economical with the truth they won't turn a blind eye.
I imported a bike from the USA a while back and the boxer left cardboard panels in the side of the crate for them to look in and the panels were holed on delivery. They do check.