Imported items beyond the "normal" limits of the game are very well possible, and could easily go undetected by Blizzard. I'd even go as far as to say that hundreds of unknown bugged and/or super items most likely still exist on the realms, but nobody is ever going to make a public appearance with them. I'll give you 3 really good reasons why:
1) If mass bugged items showed up on the realms again, Blizzard would find a way to stop the importing (again).
2) If mass bugged items showed up on the realms again, Blizzard would spend all their efforts making a more effective rust storm deleting all (or as many as possible) irregular items.
3) It's so much easier for them to go into a game with an inventory of bugged charms and destroy anyone in duels with them not having the slightest clue.
I'm not saying that there are for sure hundreds of unknown bugged items, because the amount I've seen is very selective and small. However, I think everybody knows that these items are floating around in the shadows. I'm actually surprised that importers let "legit looking" imports grow so known to the public, considering that they've already risked their methods to Blizzard just by letting them know it's still happening.