Sale 1:

https://backpack.tf/profiles/76561198080179568#!/compare/1584316800/1584403200

https://backpack.tf/profiles/76561198410026338#!/compare/1584316800/1584403200

Sold for 8 keys

sale 2:

https://backpack.tf/profiles/76561198410026338#!/compare/1584403200/1585267200

https://backpack.tf/profiles/76561198926403849#!/compare/1584230400/1584748800

https://backpack.tf/profiles/76561198305494036#!/compare/1584662400/1584748800

untrace / QS

sale 3:

https://backpack.tf/profiles/76561198269395083#!/compare/1584662400/1584748800

https://backpack.tf/profiles/76561198442349647#!/compare/1584662400/1584748800

Untrace / bulk

sale 4:

https://backpack.tf/profiles/76561198442349647#!/compare/1584748800/1584835200

https://backpack.tf/profiles/76561198354459626#!/compare/1584748800/1584835200

Keys

sale 5:

https://backpack.tf/profiles/76561198354459626#!/compare/1584748800/1584835200

https://backpack.tf/profiles/76561198120406276#!/compare/1568332800/1585958400

Untrace

Sale 6:

https://backpack.tf/profiles/76561198337734785#!/compare/1582243200/1582329600

https://backpack.tf/profiles/76561198147230623#!/compare/1582243200/1582329600

Untrace

sale 7:

https://backpack.tf/profiles/76561198147230623#!/compare/1583107200/1583193600

https://backpack.tf/profiles/76561198850274253#!/compare/1583107200/1583193600

QS

sale 8:

https://backpack.tf/profiles/76561198850274253#!/compare/1584835200/1584921600

https://backpack.tf/profiles/76561198363167259#!/compare/1583712000/1584921600

Keys

sale 9:

https://backpack.tf/profiles/76561198363167259#!/compare/1585008000/1585267200

https://backpack.tf/profiles/76561198217385159#!/compare/1584921600/1585008000

Sold for 9 keys

Sale 10:

https://backpack.tf/profiles/76561198217385159#!/compare/1584921600/1585008000

https://backpack.tf/profiles/76561198135015291#!/compare/1584835200/1585008000

Sold for Stormy Ketche + ~4 keys in sweets

use there

sale 11:

https://backpack.tf/profiles/76561198135015291#!/compare/1585872000/1587340800

https://backpack.tf/profiles/76561198120739614#!/compare/1585008000/1587340800

Sold with 1 keys for Shocked FN War Paint

Paint mini:

https://backpack.tf/suggestion/5ebcadec8da0d336663a6421

Suggestion for 17.5 keys

Total is 16.5 keys

sale 12:

https://backpack.tf/profiles/76561198098098606#!/compare/1581724800/1586304000

https://backpack.tf/profiles/76561198080179568#!/compare/1588636800/1588723200

QS

sale 13:

https://backpack.tf/profiles/76561198080179568#!/compare/1588896000/1588982400

https://backpack.tf/profiles/76561198002757046#!/compare/1588896000/1588982400

Untrace

sale 14:

https://backpack.tf/profiles/76561198842201154#!/compare/1582329600/1584576000

https://backpack.tf/profiles/76561198160107442#!/compare/1582329600/1583971200

untrace

Sale 15:

https://marketplace.tf/items/tf2/435;5;u62

$19.99 / $1.77 = 11.29 keys

$19.99 / $1.70 = 11.76 keys

$19.99 / $1.69 = 11.83 keys

$20 / $1.79 = 11.17 keys

total sales @:

8, 9, 11, 11, 12, 12, 16.5 keys

buyers up to ~8 keys,

seller at 9 keys,

taking 9 - 12 keys.