Sale 1:

https://backpack.tf/profiles/76561198841912826#!/compare/1569888000/1569974400

https://backpack.tf/profiles/76561198986498652#!/compare/1569888000/1569974400

QS

sale 2:

https://backpack.tf/profiles/76561198986498652#!/compare/1571529600/1571616000

https://backpack.tf/profiles/76561198048851745#!/compare/1573430400/1573516800

Untrace

Sale 3:

https://backpack.tf/profiles/76561198139696928#!/compare/1567123200/1568678400

https://backpack.tf/profiles/76561198009914215#!/compare/1572393600/1573084800

Bulk / untrace

sale 4:

https://backpack.tf/profiles/76561198129716937#!/compare/1570233600/1570838400

https://backpack.tf/profiles/76561198080179568#!/compare/1570752000/1570838400

QS

sale 5:

https://backpack.tf/profiles/76561198080179568#!/compare/1573516800/1573603200

https://backpack.tf/profiles/76561198271203740#!/compare/1573516800/1573603200

Sold for 10 keys

Sale 6:

https://backpack.tf/profiles/76561198093501381#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198323565601#!/compare/1566432000/1566518400

QS

sale 7:

https://backpack.tf/profiles/76561198089253101#!/compare/1567296000/1567382400

https://backpack.tf/profiles/76561198109506971#!/compare/1560038400/1567382400

https://backpack.tf/profiles/76561198089253101#!/compare/1567296000/1567382400

tradeback

sale 8:

https://backpack.tf/profiles/76561198337053760#!/compare/1571529600/1571616000

https://backpack.tf/profiles/76561198080179568#!/compare/1571529600/1571616000

QS

sale 9:

https://backpack.tf/profiles/76561198871946631#!/compare/1571875200/1571961600

https://backpack.tf/profiles/76561198312743572#!/compare/1571875200/1571961600

Sold for C9 Counter + 2 keys

sale 10:

https://backpack.tf/profiles/76561198312743572#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198081332647#!/compare/1571961600/1572048000

Sold for ~7 keys in sweets

sale 11:

https://backpack.tf/profiles/76561198081332647#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198954908705#!/compare/1571702400/1572048000

https://backpack.tf/profiles/76561198094183864#!/compare/1571875200/1572048000

Untrace

sale 12:

https://backpack.tf/profiles/76561198094183864#!/compare/1571875200/1572048000

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

Sold for 9 keys

sale 13:

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

https://backpack.tf/profiles/76561198100893394#!/compare/1571961600/1572048000

Sold for Bubbling Backbreaker + ~1.49 key in sweets

low by seller on Breaker

sale 14:

https://backpack.tf/profiles/76561198100893394#!/compare/1572307200/1572566400

https://backpack.tf/profiles/76561198869223863#!/compare/1572393600/1572480000

Sold for P Fetti Skid Lid + negligible sweets

sale 15:

https://backpack.tf/profiles/76561198869223863#!/compare/1572480000/1572566400

https://backpack.tf/profiles/76561198821294885#!/compare/1572480000/1572566400

Sold for ~8.5 keys

sale 16:

https://backpack.tf/profiles/76561198821294885#!/compare/1572480000/1572566400

https://backpack.tf/profiles/76561198031711498#!/compare/1572480000/1572566400

Sold with 4 keys for Stormy Engy

use there

Sale 17:

https://backpack.tf/profiles/76561198031711498#!/compare/1572480000/1572566400

https://backpack.tf/profiles/76561198080179568#!/compare/1572480000/1572566400

Sold for 8 keys (QS)

Sale 18, 19:

https://marketplace.tf/items/tf2/30006;5;u60

$21.99 / $1.80 = 12.22 keys

$21.99 / $1.79 = 12.28 keys

Total sales @:

7, 8, 8.5, 9, 10, 12, 12 keys

buyers up to 8 keys,

2 sellers at ~9.5 keys for a month,

calling 2 outliers on either side,

taking 8.5 - 10 keys