[Hmmm. Having an idea here. 

[@Raijinslayer] do you think it's plausible that Jaden might have told Seth that Vix doesn't have a ball on the way there? 

And [@Holy Soldier] since the post tthat might've had this detail got overwritten, would the other tube pokemon have their balls nearby? On the panels or in cases near their tube maybe? 

If the answer to both is yes, I think I have a way for Seth to figure out it's our fox friend.