Kingshot Treasure Cove: the free chest and the map grand prize
The event card is still live. A free chest is available daily; the map grand prize has a separate requirement.

Kingshot’s Treasure Cove event card is still on Google Play; when checked on November 6 UTC, it showed about two days remaining. Players looking for the free reward can open Deals, select Treasure Cove and look for the daily free chest. A store card does not establish the same availability or closing time for every kingdom, so check the event screen in yours.
The grand prize and the free chest follow different paths. An official Wiki explanation written and illustrated by player pandafather says map fragments open over successive days and their matching packs activate them. All five fragments must be activated to claim the Captain’s Treasure. Claiming the free chest requires no pack purchase and does not complete the map.
If only one day’s pack interests you, player PsychologicalSprout reported that an earlier Treasure Cove run did not require buying previous packs first. The official Wiki also says opened packs could be bought from day five onward. Those are earlier rules and one player’s record: check the available packs, complete cost and prizes on your own screen. The Wiki says pack and prize contents can vary with server progression.
The Wiki’s earlier rules screenshot also shows a default grand-prize choice that can be changed during the event. Choosing a reward suited to your current progression and confirming it before the event ends helps distinguish an item displayed on the screen from one already claimed.
Kingshot official Wiki: Treasure Cove
PsychologicalSprout’s original post
Google Play event card

