Not JJP, but another pinball company when I went to register it said this has already been registered...in Australia.
I did a service ticket, and they emailed me a new #.
It had already been taken also.
3rd time, they laughed and said this is getting embarrassing, and finally gave me a # and sent me stickers and paperwork to have a game with it's own serial number.
I printed the emails and put them in the coin box, so when I sell the game the next buyer has all that history.