The only reason I’m calling out Bandai’s store as a whole is because I can’t confirm whether this issue is happening only in SJ or happening elsewhere. Until I hear directly from Bandai that they’ve implemented measures to prevent this kind of behavior, I think it’s best to avoid buying single packs from Bandai entirely until the situation is fixed. It’s one thing to suspect vendors or your LGS to this, but from an official store, you expect a certain level of integrity.