Item 1: https://backpack.tf/item/11387276988

Sale 1:

https://backpack.tf/profiles/76561198070823302#!/compare/1771027200/1771113600

https://backpack.tf/profiles/76561198069898058#!/compare/1770854400/1771113600

Sold for 83 keys pure (ID 16726402451)

Sale 2:

https://backpack.tf/profiles/76561198069898058#!/compare/1770163200/1770508800

https://backpack.tf/profiles/76561199564942025#!/compare/1770422400/1770508800

Sold for 63 keys pure. Keys don't show up on sellers side but all keys match on buyers

Sale 3:

https://backpack.tf/profiles/76561198799201322#!/compare/1770249600/1770336000

https://backpack.tf/profiles/76561199564942025#!/compare/1770249600/1770336000

Dumped to STN for 57 keys (ID 16699023440)

Sale 4:

https://backpack.tf/profiles/76561198157621024#!/compare/1763856000/1764547200

https://backpack.tf/profiles/76561198220098345#!/compare/1763942400/1764115200

Bulk for Anti-Freeze Bomber's Bucket Hat

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Sellers:

BPTF - None

MPTF - https://marketplace.tf/items/tf2/30547;5;u65 - None

STN - https://stntrading.eu/item/tf2/Unusual+Memory+Leak+Bomber%27s+Bucket+Hat

SCM - Can't access but I assume there isn't any

Sale(s):

83, 63, 57

Leaving 57 out of the range due to it being dumped to a bot. Not to mention it took 2 days to sell for 63 so I rather go with that.

Going with 63 - 83 keys: