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I tabulated the drops from 76 individual Golden Poké Stop spins tonight. No Gym spins.
>992 items received total
>9 ?????? Coins
>401 Poké Balls, 192 Great Balls, 138 Ultra Balls
>70 Razz Berries, 56 Nanab Berries, 48 Pinap Berries
>5 Potions, 36 Super Potions, 16 Hyper Potions, 8 Max Potions
>0 Revives, 6 Max Revives, 7 Evolution Items
Average number of items per Golden Poké Stop spin:
>13.05 items per spin
>13/76 spins only gave 3-5 items
>0.12 ?????? Coins
>5.28 Poké Balls, 2.53 Great Balls, 1.82 Ultra Balls
>0.93 Razz Berries, 0.74 Nanab Berries, 0.63 Pinap Berries
>0.07 Potions, 0.47 Super Potions, 0.21 Hyper Potions, 0.11 Max Potions
>0.00 Revives, 0.09 Max Revives, 0.09 Evolution Items
This suggests that receiving a ?????? Coin is about as rare as evolution items.
Maybe it will be used as one? It's listed last after all other evolution items when viewing your items.
I finished with 10 ?????? Coins, my journal screenshots was missing one of the ten spins that dropped it.