Wow, what a story. I wasn't anywhere near that hassled about price, even when I told them the 944 on the trailer only cost me $1700.
Border guards are known to be pricks - I guess it comes with the territory. Welcome home, eh?
Funny story that made me feel good - I was once driving to a concert in Buffalo. The US border guards wanted to search my car, even after showing them the concert ticket as proof of where I was going. Luckily for me, we'd been out of town the day before, with the cats. When we travel with the cats, we put an empty pop case with cat litter in the back, rather than have them piss on the seat. Well, I forgot to take it out, so the border guard had to sift through my cat's turds, which look remarkably like hash
Hopefully he had to smell them too!! I missed the concert because they took so long. Pricks.