Thank you to Blaze for helping me find data for this. Resuggested with more sales.

https://marketplace.tf/items/tf2/31559;5;u384 - new sale at $59.99 (32 keys)

https://backpack.tf/profiles/76561199192607141#!/compare/1783468800/1783555200

https://backpack.tf/profiles/76561198414846255#!/compare/1783468800/1783555200 - sold for 27 keys

https://backpack.tf/profiles/76561199026390261#!/compare/1781568000/1781654400

https://backpack.tf/profiles/76561198091302671#!/compare/1773446400/1782259200 - sold for 26 keys

https://backpack.tf/profiles/76561198017845895#!/compare/1744502400/1781222400

https://backpack.tf/profiles/76561199564942025#!/compare/1781136000/1781222400 - sold for 23 keys

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https://backpack.tf/profiles/76561199059698603#!/compare/1782086400/1782172800

https://backpack.tf/profiles/76561198211512260#!/compare/1782086400/1782172800

Compares are a little muddied out with other trades on both sides, here's an imgur link of the trade just Incase:

https://imgur.com/a/fSHCHb5

Sold for 26 keys pure.