What @Gpaw said, here are the threads that let you know how it works.
https://overgrow.com/t/how-do-i-sign-up-for-co-op-boxes/83615/5
and
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What @Gpaw said, here are the threads that let you know how it works.
https://overgrow.com/t/how-do-i-sign-up-for-co-op-boxes/83615/5
and