Sale 1:

https://backpack.tf/profiles/76561198136944826#!/compare/1560038400/1566086400

https://backpack.tf/profiles/76561198006544512#!/compare/1566000000/1566086400

QS

sale 2:

https://backpack.tf/profiles/76561198389689295#!/compare/1562457600/1562544000

https://backpack.tf/profiles/76561198089253101#!/compare/1562371200/1562457600

QS?

Sale 3:

https://backpack.tf/profiles/76561198007858078#!/compare/1566864000/1566950400

https://backpack.tf/profiles/76561198214371349#!/compare/1566950400/1567382400

Sold for 12 keys

Sale 4:

https://backpack.tf/profiles/76561198068785008#!/compare/1567382400/1567555200

https://backpack.tf/profiles/76561198128803260#!/compare/1559606400/1569024000

SCM

Sale 5:

https://backpack.tf/profiles/76561198128803260#!/compare/1569283200/1569369600

https://backpack.tf/profiles/76561198342161127#!/compare/1569283200/1569369600

Sold with ~2 keys in sweets for HoS Vampire

use there

Sale 6:

https://backpack.tf/profiles/76561198243421932#!/compare/1566172800/1566259200

https://backpack.tf/profiles/76561198101300189#!/compare/1566086400/1566172800

https://backpack.tf/profiles/76561198799983169#!/compare/1566086400/1566172800

https://backpack.tf/profiles/76561198210125361#!/compare/1566259200/1566345600

https://backpack.tf/profiles/76561198101300189#!/compare/1566345600/1566432000

Gambling / untrace

Sale 7:

https://backpack.tf/profiles/76561197961288175#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198169756327#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198082095496#!/compare/1567728000/1567987200

Untrace

Sale 8:

https://backpack.tf/profiles/76561198082095496#!/compare/1569456000/1569542400

https://backpack.tf/profiles/76561198254309766#!/compare/1569456000/1569542400

Sold for Bubbling Dogger

use there

Sale 9:

https://backpack.tf/profiles/76561198254309766#!/compare/1569456000/1569542400

https://backpack.tf/profiles/76561198342570528#!/compare/1569542400/1569628800

Sold for CTFL Brain

use there

Sale 10:

https://backpack.tf/profiles/76561198045775820#!/compare/1567468800/1567555200

https://backpack.tf/profiles/76561198341171690#!/compare/1567382400/1567468800

Bulk

Sale 11:

https://backpack.tf/profiles/76561198341171690#!/compare/1567641600/1567728000

https://backpack.tf/profiles/76561198925960712#!/compare/1567641600/1567728000

Sold for ~16 keys

Sale 12:

https://backpack.tf/profiles/76561198925960712#!/compare/1567900800/1568160000

https://backpack.tf/profiles/76561198269484722#!/compare/1567987200/1568073600

Untrace

sale 13:

https://backpack.tf/profiles/76561198121698432#!/compare/1568678400/1568764800

https://backpack.tf/profiles/76561198036117309#!/compare/1568764800/1568851200

Sold with ~0.49 keys in sweets + OF Mop

Mop Mini:

https://backpack.tf/suggestion/5d929348d3817210a6079e62

Suggestion for 11 keys

Total is 11 keys

Sale 14:

https://backpack.tf/profiles/76561198036117309#!/compare/1569110400/1569456000

https://backpack.tf/profiles/76561198135140709#!/compare/1569283200/1569369600

Sold for Strange N&B Ballcap

use there

Sale 15:

https://backpack.tf/profiles/76561198135140709#!/compare/1569456000/1569628800

https://backpack.tf/profiles/76561198088027693#!/compare/1569542400/1569628800

Sold for ~15 keys in sweets

Sale 16, 17:

https://marketplace.tf/items/tf2/319;5;u56

$32.5 / $1.84 = 17.66 keys

$20 / $1.83 = 10.93 keys

Total sales @:

10.93, 11, 12, 15, 16, 17.66 keys

Buyers up to 9 keys,

sellers down to 16 keys,

taking 11 - 16 keys.