I like Rotation

Dead Money.

Sellers: - https://gyazo.com/e29db0607341900c544bc1d2161ff383

https://backpack.tf/item/9137587200 - 3 months @ 19 keys

Sale 1)

https://backpack.tf/profiles/76561199070255861#!/compare/1604448000/1604793600

https://backpack.tf/profiles/76561198011321852#!/compare/1604361600/1604448000 - Sold with a Professional Killstreak L'Etranger (~2 keys) + Spelled Boo Balloon (No mini but likely >0.5 keys) for an Atomic Universal Translator (18.5) = 16 keys

No buyout

Mini for Translator:

https://gyazo.com/163999233ab5ef40db89c53891f9ead1 - Sold for ~17 keys

https://marketplace.tf/items/tf2/30658;5;u92 - Consistent sales ~20 keys

Taking 18.5 as a mini

Sale 2)

https://backpack.tf/profiles/76561199085116273#!/compare/1610841600/1610928000

https://backpack.tf/profiles/76561198065746354#!/compare/1610409600/1610928000 - Untrace

Buyout was 18 keys https://gladiator.tf/listings/6004c58d443895bb06551984

Sale 3)

https://backpack.tf/profiles/76561198061880126#!/compare/1609632000/1609718400

https://backpack.tf/profiles/76561199085116273#!/compare/1609632000/1609718400 - Sold via buy order for ~17 keys + minimal ref

Sale 4)

https://backpack.tf/profiles/76561198327569682#!/compare/1609632000/1609718400

https://backpack.tf/profiles/76561198061880126#!/compare/1609459200/1609632000 - Untrace

Note: - https://backpack.tf/item/7821417928 - Excluding loot.farm and scammer transfers

Sale 5)

https://backpack.tf/profiles/76561199095402788#!/compare/1606089600/1606262400

https://backpack.tf/profiles/76561199084784906#!/compare/1606176000/1606262400 - Sold via buy order, unsure what for

Sale 6)

https://backpack.tf/profiles/76561198993631639#!/compare/1607472000/1607644800 - Untrace

Sale 7)

https://backpack.tf/profiles/76561198993631639#!/compare/1606867200/1606953600 - Untrace

Sale 8)

https://backpack.tf/profiles/76561198838223524#!/compare/1606867200/1606953600 - Untrace

Sale 9)

https://backpack.tf/profiles/76561198801979768#!/compare/1606780800/1606867200

https://backpack.tf/profiles/76561198838223524#!/compare/1606780800/1606867200 - Sold for 17 keys + minimal ref

Sale 10)

https://backpack.tf/profiles/76561198162196243#!/compare/1606262400/1607731200

https://backpack.tf/profiles/76561198801979768#!/compare/1606176000/1606262400 - Sold with a Taunt: Kazotsky Kick (~3.2 keys at time) for a Strange Professional Killstreak Rocket Launcher (18.5) = 15 keys - Below buyers

Sales 11-13)

https://marketplace.tf/items/tf2/30623;5;u60

$44.99 / $1.82 = 25 keys

$35 / $1.78 = 20 keys

$44.99 / $1.76 = 26 keys

Sales:

16, 17, 20, 25 and 26

Calling 16 low as it's below buyers

Including 17 since it's supported by sales 1 and 3

Calling 25 and 26 high due to unsold. 26 was my sale and I can confirm if I listed for keys it would've been less than 19 due to seller.

Excluding a high and low outlier helps even the range too.

Thanks =)