I remember helping Snk doing those gifts, the GM4 had like a 0.05% chance. And it had a cap, as in, only x players could get it and it was a really low number.
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Those were furnitures, it showed "0" because of a script bug. Snk had fixed it but sadly it only worked for those who got the furniture after the patch happened. So a lot of players got unusable furnitures. We actually tried to find a way for players to recover them using the furnitures ID but sadly nothing really worked out.