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"Not sure if anyone asked this yet, but would taking the coin to an event or to a virtual cache count as one of the four required caches, or do the new caches have to have a physical container?  \n  \nThis sounds like a fun game!   \n"
<https://forums.geocaching.com/GC/index.php?/topic/197168-challenge-the-earth-turtle-challenge/page/2/&tab=comments#comment-3531609>