Sale 1:

https://backpack.tf/profiles/76561198378773484#!/compare/1566604800/1566777600

https://backpack.tf/profiles/76561198230732648#!/compare/1566691200/1566777600

untrace

sale 2:

https://backpack.tf/profiles/76561198384047845#!/compare/1566518400/1566691200

https://backpack.tf/profiles/76561198080669489#!/compare/1566604800/1566691200

Untrace

sale 3:

https://backpack.tf/profiles/76561198337734785#!/compare/1565568000/1565654400

https://backpack.tf/profiles/76561198857810841#!/compare/1564617600/1565654400

Sold for 11 keys

sale 4:

https://backpack.tf/profiles/76561198857810841#!/compare/1565654400/1565740800

https://backpack.tf/profiles/76561198079243104#!/compare/1565654400/1565740800

https://backpack.tf/profiles/76561198802802073#!/compare/1565654400/1565740800

https://backpack.tf/profiles/76561198063803737#!/compare/1565654400/1565740800

https://backpack.tf/profiles/76561198166338218#!/compare/1565481600/1565740800

Untrace

sale 5:

https://backpack.tf/profiles/76561198093396587#!/compare/1565308800/1566000000

https://backpack.tf/profiles/76561197961779817#!/compare/1565827200/1566000000

https://backpack.tf/profiles/76561198233591392#!/compare/1562803200/1566086400

https://backpack.tf/profiles/76561198973894950#!/compare/1566000000/1566086400

Untrace

Sale 6:

https://backpack.tf/profiles/76561198012537041#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198197802471#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198197802471#!/compare/1567296000/1567382400

https://backpack.tf/profiles/76561198799983169#!/compare/1567296000/1567382400

Untrace

Sale 7:

https://backpack.tf/profiles/76561198152443402#!/compare/1566432000/1570665600

https://backpack.tf/profiles/76561198129380689#!/compare/1567296000/1567987200

Untrace

sale 8:

https://backpack.tf/profiles/76561198129380689#!/compare/1567296000/1567987200

https://backpack.tf/profiles/76561198279539667#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561198279539667#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198023411644#!/compare/1568073600/1568246400

https://backpack.tf/profiles/76561198233591392#!/compare/1568160000/1568246400

https://backpack.tf/profiles/76561198262993846#!/compare/1567900800/1568246400

Untrace and bulk

Sale 9:

https://backpack.tf/profiles/76561198262993846#!/compare/1568246400/1568332800

https://backpack.tf/profiles/76561198044432545#!/compare/1561507200/1568419200

https://backpack.tf/profiles/76561198320615503#!/compare/1568332800/1568419200

Untrace

Sale 10:

https://backpack.tf/profiles/76561198320615503#!/compare/1568419200/1568505600

https://backpack.tf/profiles/76561198986633877#!/compare/1568505600/1568505600

https://backpack.tf/profiles/76561198320615503#!/compare/1568419200/1568505600

https://backpack.tf/profiles/76561197965419480#!/compare/1568419200/1568592000

https://backpack.tf/profiles/76561198320615503#!/compare/1568505600/1568592000

Untrace / tradeback(?)

Sale 11:

https://marketplace.tf/items/tf2/732;5;u57

$19.99 / $1.82 = 10.98 keys

$18 / $1.82 = 9.89 keys

Sale 12:

https://backpack.tf/profiles/76561198002757046#!/compare/1570752000/1570838400

https://backpack.tf/profiles/76561198151295753#!/compare/1546992000/1570838400

untrace

Sale 13:

https://backpack.tf/profiles/76561198151295753#!/compare/1546992000/1570838400

https://backpack.tf/profiles/76561198125894529#!/compare/1570665600/1570838400

Sold for ~5 keys + spell

Spell mini:

https://backpack.tf/profiles/76561198340437816#!/compare/1570752000/1570838400

https://backpack.tf/profiles/76561198125894529#!/compare/1570665600/1570838400

Sold for Bill's (~2 keys)

Total is 7 keys

Sale 14:

https://backpack.tf/profiles/76561198125894529#!/compare/1570924800/1571011200

https://backpack.tf/profiles/76561198945548843#!/compare/1571011200/1571097600

Sold with 3 keys for TW Slo-Poke

use there

Sale 15:

https://backpack.tf/profiles/76561198945548843#!/compare/1571097600/1571270400

https://backpack.tf/profiles/76561198105892412#!/compare/1571011200/1571097600

Untrace

Total sales @:

7, 9.89, 10.98, 11 keys

buyers up to ~6.5 keys,

sellers down to ~11 keys,

taking 10 - 11 keys