The green shells
 

In aprils antique store in batlle nexus there are some green shells. What are those for? Some bonus thing that comes when you complete the game 100%? I have all the antiques but I still miss some few qrystals and S+ (or S....dont know if I can get S+ ass overall in team performance) for all stages.

Those just mean there isnt an antique to be got. That's the cut off points because all of the areas dont have the same ammount of antiques

Okay.....yeah thats clear now....why didnt I think of that....thanks. :)