"During the event, the first time you complete the daily quest each day, you receive a Zenithar’s Sublime Parcel box as a bonus reward. Each subsequent completion of the “Honest Toil” quest during that same day rewards you with a Zenithar’s Delightful Parcel box.

In addition, you can earn Zenithar’s Delightful Parcel boxes by participating in the following activities:

Completing the introductory quest “The Unrefusable Offer”
Completing any Master Writ, per discipline, per account, each day
Subsequent Master Writs of the same discipline won’t provide further boxes until the daily reset
First daily Crafting Writ, per account, completed each day
Each time you defeat a world boss while grouped with a player who is in at least one of your player guilds
Each time you complete a world event while grouped with a player who is in at least one of your player guilds
You also have a chance to earn a Zenithar’s Delightful Parcel box when conquering each round of a group-based arena challenge or completing a Cycle in the Infinite Archive while teamed up with a player who is a member of at least one of your guilds. Additionally, the final round’s reward chest contains a guaranteed parcel, as will Tho’at Replicanum’s reward chest."

Isn't this a new change? I feel like I remember even last year getting these parcels on multiple characters doing crafting dailies.