New sales:

https://backpack.tf/profiles/76561198256840282#!/compare/1646179200/1646265600

https://backpack.tf/profiles/76561198220720512#!/compare/1646179200/1646265600 - Sold with 7 keys for a Burning Flames Steel Shako - Can be used there

Buyout was 50 keys https://gladiator.tf/listings/621f55929d40103053fa3d6d

https://backpack.tf/profiles/76561198987926475#!/compare/1646092800/1646179200

https://backpack.tf/profiles/76561198256840282#!/compare/1646092800/1646179200 - 53 keys removed but I doubt it was 53 since they listed for 50 afterwards. I'd be cautious and just exclude this.

Missing sales:

https://backpack.tf/profiles/76561198040186479#!/compare/1643241600/1643328000 - Blizz Bandana, looks low

https://backpack.tf/profiles/76561198037171335#!/compare/1642982400/1643155200 - Bulk

https://backpack.tf/profiles/76561198054796945#!/compare/1640390400/1640563200

https://backpack.tf/profiles/76561198109986831#!/compare/1640476800/1640563200 - Sold for 31 keys

https://backpack.tf/profiles/76561198044254513#!/compare/1639785600/1639872000 - Sold for 30 keys

https://backpack.tf/profiles/76561198850274253#!/compare/1640736000/1640822400

https://backpack.tf/profiles/76561198390448212#!/compare/1640736000/1640822400 - Sold for 33 keys

https://backpack.tf/profiles/76561199185696636#!/compare/1640390400/1640476800

https://backpack.tf/profiles/76561198850274253#!/compare/1640390400/1640476800 - Untrace

https://backpack.tf/profiles/76561199185696636#!/compare/1638662400/1639699200

https://backpack.tf/profiles/76561197971403645#!/compare/1639612800/1639699200 - Looks like 35 but they don't match

https://backpack.tf/profiles/76561198049526097#!/compare/1643846400/1643932800

https://backpack.tf/profiles/76561198160772050#!/compare/1643846400/1643932800 - Sold for 42 keys

https://backpack.tf/profiles/76561198049526097#!/compare/1643068800/1643846400

https://backpack.tf/profiles/76561198054272235#!/compare/1643760000/1643846400 - Bulk

https://backpack.tf/profiles/76561199199711319#!/compare/1641945600/1642118400

https://backpack.tf/profiles/76561198054272235#!/compare/1641945600/1642032000 - High

https://backpack.tf/item/10897217098 https://marketplace.tf/items/tf2/30767;5;u200

$120 / $1.84 = 65 keys

https://marketplace.tf/items/tf2/30767;5;u200

$119.99 / $1.83 = 66 keys

The vast majority of sales here are below the suggested range, albeit there is a 37 key buyer, but I would at least include 37 in the range here.