Originally Posted by chillinfar

Nutaku posted something about those who didn't reached cards on past shard event. If shards from past are available, is a good notice.

The only thing I could find was this on the Pero news feed

->Open Spoiler<-

2016-02-29

◆Information
The first PeroPero Shards event has ended!.

Shards are still enabled as well as the tradable cards and items for those of you who hadn't had the time to exchange the leftovers.
Thank you for being a part of it, and stay tunned to PeroPero Seduction!

The PeroPero Team

I really haven't notice if my shards carried over or not, but other people have confirmed this seems to be the case.