Does anyone know of official information on the other 4 Minkai seals? Spoilers

[Liam Warner]

I'm just wondering is there any official sources for information on the 5 Minkai seals anywhere other than the adventure itself?

Reason I'm asking.

Spoiler:

I'm asking because I was thinking (assuming I get the free time to run it of having the jade regent only in possession of three and why there's been so little support of the search for the Amatatsu is that their forces are searching for the other one protected from them which they know to be somewhere closer at hand.

Specifically it's hidden in the wizards tower from the ruby phoenix tournament a fact that becomes apparent when a tournament winners description reveals an Imperial seal is stored inside it. The Oni can't just barge in and take it because the rules of golden perfection require the seals to be given. Of course winning the tournament will count. A high ranking noble will mention it's presence to the PCs giving them a reason to compete so someone can claim it as their one item (also if I have any player turnover allows new ones to also become scions of a different line.

Right now I haven't decided to have them be told by the noble they meet where first arriving from the crown of the world or one of the groups they need to acquire as allies as part off their price for joining.