Sale 1:

https://backpack.tf/profiles/76561198348946408#!/compare/1569024000/1569369600

https://backpack.tf/profiles/76561198124221469#!/compare/1569283200/1569369600

Sold for 11 keys

Sale 2:

https://backpack.tf/profiles/76561198124221469#!/compare/1569283200/1569369600

https://backpack.tf/profiles/76561198002757046#!/compare/1569283200/1569369600

Sold for 12 keys

Sale 3:

https://backpack.tf/profiles/76561198063783607#!/compare/1570838400/1571011200

https://backpack.tf/profiles/76561198406237177#!/compare/1570752000/1570838400

Sold for Searing Capuchon + ~1 key in sweets

use there

Sale 4:

https://backpack.tf/profiles/76561198406237177#!/compare/1570752000/1570838400

https://backpack.tf/profiles/76561198337734785#!/compare/1570752000/1570838400

QS

Sale 5:

https://backpack.tf/profiles/76561198090427061#!/compare/1565222400/1566086400

https://backpack.tf/profiles/76561198337734785#!/compare/1566000000/1566086400

QS

Sale 6:

https://backpack.tf/profiles/76561198337734785#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198201364639#!/compare/1566345600/1566432000

Sold for 15 keys

Sale 7:

https://backpack.tf/profiles/76561198073093356#!/compare/1566518400/1566604800

https://backpack.tf/profiles/76561198337734785#!/compare/1566432000/1566518400

QS

Sale 8:

https://backpack.tf/profiles/76561198068356593#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198973894950#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198329023090#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198865354802#!/compare/1569888000/1570233600

https://backpack.tf/profiles/76561198432461884#!/compare/1570147200/1570233600

Gambling

sale 9:

https://backpack.tf/profiles/76561198247142022#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198002757046#!/compare/1565913600/1566000000

QS

Sale 10:

https://backpack.tf/profiles/76561198002757046#!/compare/1566604800/1566691200

https://backpack.tf/profiles/76561198355708209#!/compare/1566518400/1566691200

Sold for 15 keys

Sale 11:

https://marketplace.tf/items/tf2/30399;5;u62

$39.6 / $1.80 = 22.00 keys

$24 / $1.83 = 13.11 keys

$25.5 / $1.82 = 14.01 keys <---- https://backpack.tf/item/7956447009 either 25.5 or 24.99

$24.99 / $1.82 = 13.73 keys

Total sales @:

11, 12, 13.11, 13.73, 14.01, 15, 15, 22 keys

sellers at 15 keys,

buyers up to 9 keys,

calling 22 the outlier,

Taking 11 - 15 keys