Forgive me if it’s obvious, but what does “waves their share” mean?

Yeah they were called CHEX QUEST and it was awesome.

Well it’s at a thrift shop so it’s courteous to have the pieces in a bag because it implies that the complete puzzle is present when you decide to buy it or not.

If it’s a used puzzle and the pieces are free range then it has the chance to be really disappointing when you can only learn it wasn’t a complete board after you are 99.995% finished with it.