Right. The same place they always tell people the tomes are only available to obtain during the event. That box is not new, just the addition that "item exchange" would also not be available. It would be nice if they explained why they changed things up, but it's their discretion to do that any time. They made sure the information was out there about the change.
And again, just because you can do something does not mean you should, that it will be liked or appreciated, etc.

But that's something the brown nosers can't recognize because they're too busy brown nosing.