Sale 1:

https://backpack.tf/profiles/76561198069493147#!/compare/1567296000/1567382400

https://backpack.tf/profiles/76561198275390406#!/compare/1566777600/1567296000

Sold for ~16 keys

Sale 2:

https://backpack.tf/profiles/76561198275390406#!/compare/1567728000/1567814400

https://backpack.tf/profiles/76561198002757046#!/compare/1567728000/1567814400

QS

sale 3:

https://backpack.tf/profiles/76561198002757046#!/compare/1567728000/1567814400

https://backpack.tf/profiles/76561197964171516#!/compare/1567641600/1567814400

Keys, maybe bulk?

Sale 4:

https://backpack.tf/profiles/76561197964171516#!/compare/1568592000/1568678400

https://backpack.tf/profiles/76561198115069320#!/compare/1568678400/1569196800

Sold for 22 keys

Sale 5:

https://backpack.tf/profiles/76561198866635126#!/compare/1566259200/1566432000

https://backpack.tf/profiles/76561198056086416#!/compare/1566345600/1566432000

Bulky / low

Sale 6:

https://backpack.tf/profiles/76561198056086416#!/compare/1566518400/1566604800

https://backpack.tf/profiles/76561197997331749#!/compare/1566518400/1566604800

Sold for ~14 keys

sale 7:

https://backpack.tf/profiles/76561197997331749#!/compare/1566604800/1566691200

https://backpack.tf/profiles/76561198131983415#!/compare/1566432000/1566691200

Sold for 15 keys

Sale 8:

https://backpack.tf/profiles/76561198131983415#!/compare/1567728000/1567814400

https://backpack.tf/profiles/76561198131799675#!/compare/1567728000/1567814400

Sold for ~14 keys

sale 9:

https://backpack.tf/profiles/76561198131799675#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198121635128#!/compare/1567900800/1567987200

Sold for Steaming Fedora

Fedora Mini:

https://backpack.tf/suggestion/5dccc448678072473424dfc1

Suggestion for 14.5 keys

Sale 10:

https://backpack.tf/profiles/76561198121635128#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198081247373#!/compare/1567814400/1567987200

Sold for Lantern Handle

use there

Sale 11:

https://backpack.tf/profiles/76561198081247373#!/compare/1568332800/1568419200

https://backpack.tf/profiles/76561198817270631#!/compare/1568332800/1568419200

Sold for DBD Geisha

use there

Sale 12:

https://backpack.tf/profiles/76561198817270631#!/compare/1570406400/1570838400

https://backpack.tf/profiles/76561198348683899#!/compare/1570579200/1571011200

Sold for Miami Tipped(20)

sale 13:

https://marketplace.tf/items/tf2/614;5;u11

$33 / $1.76 = 18.75 keys <--- https://backpack.tf/item/7109503349

$33 / $1.79 = 18.44 keys

Total sales @:

14, 14, 14.5, 15, 16, 18.44, 18.75, 20, 22 keys

buyers up to 11 keys,

take the wide range of 14 - 22 keys.