I bought a grey market 1984 Mercedes 500SEC coupe in New Mexico 22 years ago (my second car!), it was first imported to California, and had the Sticker in its door jam so registering it in CA again after a few decades out of state was possible.
I'm really surprised for these prices. This G is the twin of mine. In 2017 I spent 7k euro for her including new tyres and 175k kilometers. Here in Italy, Gwagen were really cheap until 2 years ago; now prices are growing up but not like in USA. For the same truck of the auction you can spend not over 15k euro. Consider that rear seats are missing because in 90' was possible, reducing the number of seats, to modify the G wagen from car to truck and save a lot of money of taxes. But now it is not possible to covert the truck to car again. For this reason we are exporting these car with 0 euro value in USA. In Italy are only good for spare parts especially because they are Euro 0 class emission.