Even though they seem to be nice people, they try to enforce regulations as they see them, rather than as actually written.
You should have seen the hassle I got when I tried to mail a pocketknife to Japan. The fact that I already read the regs online didn't impress them. I told them that only swords needed a special customs clearance to send to Japan. Probably to allow the Japanese government to scoop up any really valuable samurai swords for museums, rather than letting them go to private purchasers.
She looked up the mailing regs for Japan in a phonebook-sized book. It agreed with me, but noooooo, she had to call Bill from out back, who had THE BIG BOOK. He comes up with this hugh hardcover book, about the size of three big-city phonebooks, and looks up "Japan" again. Again, the book agrees with me.
The woman grudgingly took my package, but not without warning, "don't blame me if customs confiscates it." It made the journey without further troubles, once it left the local post office.