Barg'n-Mart

https://backpack.tf/item/4688871163

Sale 1) Bulk sale for a Burning Flames Hephaistos' Handcraft + 6 Keys

https://backpack.tf/profiles/76561198107839402#!/compare/1559952000/1560038400

Sale 2) Sold for 27 Keys + ~1 Key of Refined

https://backpack.tf/profiles/76561198142853906#!/compare/1561161600/1561593600

https://backpack.tf/profiles/76561198087763379#!/compare/1561334400/1561420800

27 + 1 = 28 Keys

Sale 3) Sold for 28 Keys + 19.33 Refined

https://backpack.tf/profiles/76561198087763379#!/compare/1561420800/1561507200

Rounds to 28 Keys

https://backpack.tf/item/5108068415

Sale 4) Sold for 30 Keys

https://backpack.tf/profiles/76561198335791307#!/compare/1556928000/1557014400

Sale 5) Bulk sale for a Green Black Hole Milkman

https://backpack.tf/profiles/76561198050509345#!/compare/1557100800/1557187200

Sale 6) Quicksold for 26 Keys + 12.11 Refined

https://backpack.tf/profiles/76561198215559840#!/compare/1557100800/1557187200

Sale 7) ?

https://backpack.tf/profiles/76561198337734785#!/compare/1558742400/1558828800

https://backpack.tf/profiles/76561198251324338#!/compare/1558742400/1558828800

https://marketplace.tf/items/tf2/30718;5;u103 - Sold for $62 when Keys were ~$1.80 each

https://marketplace.tf/items/tf2/5021;6

62 / 1.80 = 34.4, which rounds to 34 Keys

https://imgur.com/a/kqLwhq2 - Calling 34 Keys high because of a 10 day seller at 33 Keys

https://backpack.tf/item/4688871163