FWIW, I've had to order parts from KT on 4 occasions. 3 of them for losing things....
All I was asked for was Name and address. I offered to pay all 4 times, the only times they accepted it was when I needed a spare.
I sent both of my PF-9s in for the "walking frame pin" fix. I didn't even call KT first. Boxed them up, wrote a nice letter, sent them both. No other paperwork, no problems.