Warning: Gach box at your own risk.

It would only mean something if he got MW30 with the box. Your justification isn't a very good one. >_>

There was only one known MW 30 book left in windia before the SC, with the only glitched MW 30 drop from horntail having been used immediately. The appearance of a cheap MW 30 in a shop along with tons of mastery books, level 80/90 weapons, and a gun 50% must be extremely coincidental not for it to have come from a box.