Here's the clarification for vouchers:

Once the Crafting version is out, all item vouchers earned from previous events will turn into RECIPES. Not the items. Not the materials for the recipes. Just the recipes themselves. These recipes are unique. If a player did not earn the voucher previously, they will never have these recipes. They will not be made available again.

EDITED: BC I don't know how to read sometimes. Apologies. Yes, Recipes.