Sale 1:

https://backpack.tf/profiles/76561198271809508#!/compare/1566259200/1568592000

https://backpack.tf/profiles/76561198121830870#!/compare/1566172800/1566259200

Untrace

Sale 2:

https://backpack.tf/profiles/76561198121830870#!/compare/1566172800/1566259200

https://backpack.tf/profiles/76561198143789143#!/compare/1566172800/1566259200

Sold for KaW Tailor + ~3 keys in sweets

Tailor Mini:

https://backpack.tf/suggestion/5d7f4574d381720d2f455b9e

Suggestion for 11 keys

Total is 14 keys

Sale 3:

https://backpack.tf/profiles/76561198828474306#!/compare/1548892800/1566000000

https://backpack.tf/profiles/76561198260686830#!/compare/1566172800/1566259200

Untrace

Sale 4:

https://backpack.tf/profiles/76561198260686830#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198206979411#!/compare/1566691200/1567728000

Sold for 15 keys

sale 5:

https://backpack.tf/profiles/76561198206979411#!/compare/1567900800/1568592000

https://backpack.tf/profiles/76561198337734785#!/compare/1567987200/1568073600

QS?

Sale 6:

https://backpack.tf/profiles/76561198004952793#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198119605994#!/compare/1566259200/1566432000

Sold for Hg Geisha

use there

Sale 7:

https://backpack.tf/profiles/76561198073896407#!/compare/1566172800/1566345600

https://backpack.tf/profiles/76561198334727790#!/compare/1566259200/1566345600

Sold for ~11 keys

Sale 8:

https://backpack.tf/profiles/76561198334727790#!/compare/1566432000/1566518400

https://backpack.tf/profiles/76561198118580639#!/compare/1565827200/1566518400

Untrace

Sale 9:

https://backpack.tf/profiles/76561198183328882#!/compare/1566000000/1566950400

https://backpack.tf/profiles/76561198202896230#!/compare/1561248000/1567814400

Untrace

Sale 10:

https://marketplace.tf/items/tf2/30307;5;u59

$32.73 / $1.82 = 17.98 keys <-- https://backpack.tf/item/7956790125

total sales @:

11, 14, 15, 17.98 keys

Buyers up to 10 keys,

buyer at 14, fairly new,

seller at 17 is new too...

gonna take large range of 11 - 18 keys,

puts aging seller at near middle and sales at middle too.