not only is shonen jump an unofficial source, but its also a japanese onewait on the ruling change lol. apparently there was a page in the recent SJ magazine that basically said the tewart ruling of xyz's is completely wrong. if this is accurate expect tour guides to plummet in value to probably around 80-100. in any case i don't see any way to get your money back from any box atm. i would just invest your money into individual cards but first and foremost, wait for the official tcg ruling on xyz's.
also, pick up a tin if you haven't already!
tewart is the ultimate authority on the tcg. it doesn't matter whether he's 'wrong' or not. we know he's 'wrong' and weve known that since he announced his ruling at gencon. being able to activate a monster's effect with priority when it's summoned is 'wrong' too but we're still doing that a full 6 months later.
the article tells us nothing we didnt already know
even if by some zany chance tewarts ruling is overturned, tour guide will still be staple in almost every deck because its that fucking good, immediate sangan search or not. it was 80 bucks when xyzs didnt even exist yet lol, nothing short of a reprint will bring it anywhere close to that ever again