Do u think Stern would bother going to those lengths over only a handful of machines.
Also, who's to say the Stern dealer didn't sell it to an American customer In the USA who later sold the game privately second hand. It's not like any of the Stern dealers Have to supply Stern HQ with the names and addresses of the people who buy machines. But I guess if u did buy five or six machines all from the same Stern agent and all those machines turned up in Australia to the same collector it would look like a pattern.
I don't think Stern would spend the time looking at the database, too many machines and too many records to look at and then cross match for only a handful of machines plus they would lose sales if they lost a dealer and they need every sale they can get in this economy. ?