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History: https://backpack.tf/item/9138745518
Bulk:
https://backpack.tf/profiles/76561198071879537#!/compare/1607644800/1607731200
https://backpack.tf/profiles/76561198061779536#!/compare/1607644800/1607731200
Numerous tradebacks
7 keys (none of the keys in buyer's compare match)
https://backpack.tf/profiles/76561198061779536#!/compare/1612310400/1612483200
https://backpack.tf/profiles/76561198971674711#!/compare/1612396800/1612483200
One sold on marketplace.tf, can't trace the history: https://marketplace.tf/items/tf2/31112;5;u18
December 25: $16.99/2.13=7.98 ~8 keys
Going with 7-8