Sale 1:

https://backpack.tf/profiles/76561198053252981#!/compare/1564185600/1564358400

https://backpack.tf/profiles/76561198798960540#!/compare/1561939200/1566777600

Untrace

Sale 2:

https://backpack.tf/profiles/76561198050518375#!/compare/1564704000/1564790400

https://backpack.tf/profiles/76561198821791462#!/compare/1564790400/1564876800

Sold for 8 keys

Sale 3:

https://backpack.tf/profiles/76561198821791462#!/compare/1565136000/1565222400

https://backpack.tf/profiles/76561198095516971#!/compare/1565136000/1565222400

Keys, or unusual... can't tell

Sale 4:

https://backpack.tf/profiles/76561198095516971#!/compare/1565222400/1565308800

https://backpack.tf/profiles/76561198048851745#!/compare/1565222400/1565308800

QS

sale 5:

https://backpack.tf/profiles/76561198066367407#!/compare/1560470400/1560643200

https://backpack.tf/profiles/76561198095252967#!/compare/1560470400/1560643200

Sold with ~2 keys in sweets for Vivid Warming(11)

Total is 9 keys

Sale 6:

https://backpack.tf/profiles/76561198095252967#!/compare/1560470400/1560643200

https://backpack.tf/profiles/76561198401731069#!/compare/1560556800/1560643200

Untrace, keys.

Sale 7:

https://backpack.tf/profiles/76561198401731069#!/compare/1560643200/1560729600

https://backpack.tf/profiles/76561198316961222#!/compare/1560643200/1560729600

Sold for ~9 keys

Sale 8:

https://backpack.tf/profiles/76561198050518375#!/compare/1564790400/1564876800

https://backpack.tf/profiles/76561198061440669#!/compare/1564790400/1564876800

Bulk QS?

Sale 9:

https://backpack.tf/profiles/76561198061440669#!/compare/1564790400/1564876800

https://backpack.tf/profiles/76561198415368238#!/compare/1565136000/1565222400

SCM

Sale 10:

https://backpack.tf/profiles/76561198415368238#!/compare/1565654400/1566000000

https://backpack.tf/profiles/76561198082311111#!/compare/1565740800/1565913600

Sold for KaW Esteem

Esteem Mini:

https://backpack.tf/suggestion/5d7adca4d3817263a70f4a3c

Suggestion for 8 keys

Sale 11 - 13:

https://marketplace.tf/items/tf2/106;5;u32

$18 / $1.84 = 9.78 keys <-- https://backpack.tf/item/7264001182

$18.69 / $1.85 = 10.10 keys

$16.35 / $1.82 = 8.98 keys

Total sales @:

8, 8, 8.98, 9, 9, 9.78, 10.10 keys

seller for ~8.5 keys, dropped from ~9.5 keys,

gonna take 8 - 10 keys, conserving around most sales.