It's about time they caught on.
While I never did go online to do battles with the cartridge in a different Region 3DS,
I did accidentally use the same save (on a different Region 3DS, pre-GameSync) to collect a wonder card for screenshots,
(which I remember the incident very clearly), so that is how they caught me.
I probably went online without checking my Luma's Region setting.
(it was set to a different region settings, argh)
We will update this page, as the story develops.
Sources: Me. [yeah, that's my game up there.]