Second to the last day of the Seelie event, still easy but with a wider scope. There are no spawning mobs when you pick up a coin, but there's lots of monsters nearby especially in Tianqui Valley. Just clear them out before searching if you want your Seelie companion's search to be smooth.
If you're having trouble finding coins in your game, pause on the map as I marked some coin locations I found in both areas. Any spot would do.
00:10 Dawn Winery (Treasure area 11)
01:23 Tianqiu Valley (Treasure area 12)
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