Sale 1:

https://backpack.tf/profiles/76561198119597043#!/compare/NaN/1569974400

https://backpack.tf/profiles/76561198127938353#!/compare/1569888000/1569974400

Sold with 2 keys for Steaming Cowl(10)

Total is 8 keys

sale 2:

https://backpack.tf/profiles/76561198127938353#!/compare/1572566400/1572652800

https://backpack.tf/profiles/76561198867740673#!/compare/1572652800/1572825600

Sold for ~12 keys

sale 3:

https://backpack.tf/profiles/76561198867740673#!/compare/1572912000/1572998400

https://backpack.tf/profiles/76561198146569609#!/compare/1572825600/1573084800

Sold for TW Berliner

use there

Sale 4:

https://backpack.tf/profiles/76561198411423518#!/compare/1569542400/1569974400

https://backpack.tf/profiles/76561198052196602#!/compare/1569888000/1569974400

Bulk

Sale 5:

https://backpack.tf/profiles/76561198052196602#!/compare/1570406400/1570492800

https://backpack.tf/profiles/76561198396471883#!/compare/1570233600/1570665600

Untrace

sale 6:

https://backpack.tf/profiles/76561198396471883#!/compare/1570665600/1571097600

https://backpack.tf/profiles/76561198061376237#!/compare/1570752000/1570838400

Sold with ~6 keys for Clair Handcraft(16.5)

Total is 10.5 keys

sale 7:

https://backpack.tf/profiles/76561198341171690#!/compare/1569715200/1569801600

https://backpack.tf/profiles/76561198210718676#!/compare/1569801600/1569888000

Sold for 13 keys

Sale 8:

https://backpack.tf/profiles/76561198320346037#!/compare/1566259200/1566345600

https://backpack.tf/profiles/76561198302161698#!/compare/1566259200/1566345600

Sold for C9 Oiled(9.25)

Sale 9:

https://marketplace.tf/items/tf2/31000;5;u113

$22.4 / $1.82 = 12.31 keys

Total sales @:

8, 9.25, 10.5, 12, 12.31, 13 keys

buyers up to ~8 keys, one at ~8.5, one ~9 keys,

sellers down to 14 keys

taking 9 - 13 keys.