I used to live in Aberdeen where this Juke was first registered and in the 70’s and 80’s serious rust was typical in cars of this age. I had a six year old Morris 1100 with such bad rust that it no structural sills left and had several large holes through the floor. This should not apply so much to modern cars but it might be a factor.
Have you also checked its approximate build date. Seat belt labels and plastic components such as ashtrays will have a date stamp. With just in time assembly processes this will give you a true year of build. You might find a long gap before being registered. It could have been stored in the open but you can’t prove this. It may not add legal weight to any rejection as cars are advertised as the year of registration, not build. However it only takes a couple of minutes to check and it might throw up a discrepancy you can use to persuade the dealer to concede your case.