I was able to meet the employees at Spooky Pinball, but unfortunately they had never heard of those damn Junji Ito pinball machines. They were very nice and offered to let me try out their latest acquisition, "Beetlejuice," before it was delivered, but I admit I wasn't really in the mood for it.
I still have to go to the dump/warehouse that Paul told me about, but it's quite far away, and since I haven't slept (except for a few hours in the car I rented at the airport), I'm going to find a hotel. I'm jetlagged.
While searching around Wisconsin, I stumbled upon this website: https://pinballsalvage.com/, but the manager, Richard Conti, seems to have become a buyer/reseller of just about anything and everything (old video games, valuable jewelry, etc.). I'm still going to try to go to Cudahi to see if I can meet him.
Sorry, it's not very convincing at the moment. I thought that by going directly to the United States, everyone would have heard about this pinball machine, but maybe this forum has had a magnifying effect...