Can I use Keys earned in a Treasure Hunt for a different Treasure Hunt deal?

Keys are exclusive to the Treasure Hunt where they are gained, so you cannot use Keys earned in one Treasure Hunt in a different Treasure Hunt.

For more details and guidance, please refer to the official Treasure Hunt guide. 

https://blidz.zendesk.com/hc/en-us/sections/360005177160-Treasure-Hunt-Official-Guide