Some guy of the server chat today said it's possible to get 2 exchange coupons for Boss gear, 1 for completing the season and 1 for the 40 Seashells.  Is it even possible to use both ? Because I'm still thinking of what's better a Kutum weapon or Dim tree armor. 
And my second question: If I'd buy the weapon exchange coupon for the Seashells and get a second pair of pen Tuvala weapons and switch them imidately to another class will they get deleted at the end of the season? 
Thx for everyone who can answer this. :) 

No limit to boss coupon usage. If you have them then you can use them. The second question is a little trickier to answer because normally you are only allowed one conversion stone for each slot of tuvala gear but because of the timepiece option no one can say if they are changing that rule.

Ohhhh yep I forgot about the stones that answered my question. Thanks