Sale 1:

https://backpack.tf/profiles/76561198347536169#!/compare/1572307200/1572393600

https://backpack.tf/profiles/76561198146434815#!/compare/1572307200/1573084800

Bulky

sale 2:

https://backpack.tf/profiles/76561198337734785#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198094047037#!/compare/1566345600/1566432000

Sold for 12 keys

sale 3:

https://backpack.tf/profiles/76561198094047037#!/compare/1571529600/1571788800

https://backpack.tf/profiles/76561198084126218#!/compare/1571702400/1571788800

Bulk

sale 4:

https://backpack.tf/profiles/76561198337734785#!/compare/1565654400/1565740800

https://backpack.tf/profiles/76561198080157471#!/compare/1565654400/1565740800

Sold for 17 keys

sale 5:

https://backpack.tf/profiles/76561198080157471#!/compare/1567468800/1567555200

https://backpack.tf/profiles/76561198878697169#!/compare/1565481600/1568332800

Sold for 20 keys

sale 6:

https://backpack.tf/profiles/76561198059617889#!/compare/1568592000/1569196800

https://backpack.tf/profiles/76561198100501153#!/compare/1569110400/1569196800

Untrace

sale 7:

https://backpack.tf/profiles/76561198100501153#!/compare/1570320000/1570492800

https://backpack.tf/profiles/76561198186922501#!/compare/1570060800/1570320000

Bulk

sale 8:

https://backpack.tf/profiles/76561198186922501#!/compare/1571616000/1571702400

https://backpack.tf/profiles/76561198847672167#!/compare/1571443200/1571702400

Bulk

sale 9:

https://backpack.tf/profiles/76561198847672167#!/compare/1572566400/1572652800

https://backpack.tf/profiles/76561198048334414#!/compare/1572566400/1572652800

Sold for 14 keys

Sale 10:

https://backpack.tf/profiles/76561198048334414#!/compare/1573084800/1573171200

https://backpack.tf/profiles/76561198334598690#!/compare/1573171200/1573257600

QS

Sale 11:

https://backpack.tf/profiles/76561198032016356#!/compare/1571616000/1572048000

https://backpack.tf/profiles/76561198821294885#!/compare/1571961600/1572048000

Sold for ~10 keys

Sale 12:

https://backpack.tf/profiles/76561198821294885#!/compare/1572048000/1572134400

https://backpack.tf/profiles/76561198206848157#!/compare/1572048000/1572134400

Sold for keys, can trace at least 6....

Sale 13:

https://backpack.tf/profiles/76561198206848157#!/compare/1572048000/1572134400

https://backpack.tf/profiles/76561198138135050#!/compare/1572048000/1572134400

Sold for N&B Warmer + ~2 keys

use there

Sale 14:

https://backpack.tf/profiles/76561198138135050#!/compare/1572134400/1572220800

https://backpack.tf/profiles/76561198290557868#!/compare/1572134400/1572220800

Sold for 12 keys

Sale 15:

https://backpack.tf/profiles/76561198290557868#!/compare/1572220800/1572307200

https://backpack.tf/profiles/76561198026129220#!/compare/1572220800/1572307200

QS

Sale 16 - 18:

https://marketplace.tf/items/tf2/30863;5;u15

$26.6 / $1.82 = 14.62 keys

$22.3 / $1.80 = 12.39 keys <--- https://backpack.tf/item/5789515202

$27.99 / $1.79 = 15.64 keys <--- https://backpack.tf/item/8125438431

Total sales @:

10, 12, 12, 12.39, 14, 14.62, 15.64, 17, 20 keys

buyers up to 10 keys,

newish seller for 17 keys,

calling 10 low,

20 high,

taking 12 - 17 keys