Sale 1:

https://backpack.tf/profiles/76561198109727871#!/compare/1565654400/1568246400

https://backpack.tf/profiles/76561198072158788#!/compare/1513209600/1569715200

SCM

Sale 2:

https://backpack.tf/profiles/76561198305494036#!/compare/1563753600/1563840000

https://backpack.tf/profiles/76561198202552238#!/compare/1563753600/1563840000

Keys

Sale 3:

https://backpack.tf/profiles/76561198148983233#!/compare/1563753600/1563840000

https://backpack.tf/profiles/76561198286257338#!/compare/1563753600/1563840000

Sold for ~18 keys

sale 4:

https://backpack.tf/profiles/76561198286257338#!/compare/1564617600/1564704000

https://backpack.tf/profiles/76561198131479738#!/compare/1564617600/1564704000

Bulk

Sale 5:

https://backpack.tf/profiles/76561198131479738#!/compare/1564790400/1564876800

https://backpack.tf/profiles/76561198087540393#!/compare/1564617600/1564876800

Sold for Clocked Dead Cone

use there

Sale 6:

https://backpack.tf/profiles/76561198087540393#!/compare/1564876800/1565395200

https://backpack.tf/profiles/76561198063512035#!/compare/1564963200/1565136000

Sold for 19 keys

Sale 7:

https://backpack.tf/profiles/76561198084698407#!/compare/1564531200/1569283200

https://backpack.tf/profiles/76561198023051867#!/compare/1565827200/1565913600

SCM

sale 8:

https://backpack.tf/profiles/76561198843030293#!/compare/1566000000/1566259200

https://backpack.tf/profiles/76561198084937685#!/compare/1566172800/1566259200

Sold for 15 keys

Sale 9:

https://backpack.tf/profiles/76561198303480656#!/compare/1562803200/1564531200

https://backpack.tf/profiles/76561198135483308#!/compare/1568419200/1568851200

SCM

sale 10:

https://backpack.tf/profiles/76561198130185987#!/compare/1565136000/1566000000

https://backpack.tf/profiles/76561198091502579#!/compare/1565913600/1566000000

QS

sale 11:

https://backpack.tf/profiles/76561198046405157#!/compare/1562025600/1564704000

https://backpack.tf/profiles/76561198133902841#!/compare/1564790400/1566086400

Untrace

Sale 12:

https://backpack.tf/profiles/76561198129911935#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198141505774#!/compare/1565913600/1566000000

Untrace

Sale 13:

https://backpack.tf/profiles/76561198141505774#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198040674653#!/compare/1566000000/1566086400

Sold for 13 keys

Sale 14:

https://backpack.tf/profiles/76561198100879076#!/compare/1568764800/1568851200

https://backpack.tf/profiles/76561198061890230#!/compare/1568764800/1568851200

Bulk

sale 15:

https://backpack.tf/profiles/76561198061890230#!/compare/1568764800/1568851200

https://backpack.tf/profiles/76561198095236132#!/compare/1568764800/1568851200

Bulk QS

Sale 16:

https://backpack.tf/profiles/76561198095236132#!/compare/1569715200/1569801600

https://backpack.tf/profiles/76561198353662004#!/compare/1569715200/1569801600

Sold with ~0.5 keys in sweets for Searing Engy Cap(16.5)

Total is 16 keys

Sale 17, 18:

https://marketplace.tf/items/tf2/778;5;u61

$12 / $1.83 = 6.56 keys

$28 / $1.84 = 15.22 keys <-- https://backpack.tf/item/7956348724

Total sales @:

6.56, 13, 15, 15.22, 16, 18, 19 keys

buyers up to 10 keys,

unsold for 20 keys,

taking the wide range of 13 - 19 keys.