Sale 1:

https://backpack.tf/profiles/76561198799373670#!/compare/1546992000/1547251200

https://backpack.tf/profiles/76561198148511293#!/compare/1547164800/1547251200

Sold for Clair Sinner + PE Dread Riding

Clair Mini:

https://backpack.tf/suggestion/5c48280244325a18bd5b2c9c

Suggestion for 31.5 keys

Sale 2:

https://backpack.tf/profiles/76561198148511293#!/compare/1547337600/1547424000

https://backpack.tf/profiles/76561198262398620#!/compare/1547337600/1547424000

Bulk

Sale 3:

https://backpack.tf/profiles/76561198262398620#!/compare/1547510400/1547596800

https://backpack.tf/profiles/76561198863709718#!/compare/1547510400/1547596800

Can't tell

Sale 4:

https://backpack.tf/profiles/76561198863709718#!/compare/1547596800/1547683200

Untrace

Sale 5:

https://backpack.tf/profiles/76561198262174730#!/compare/1543795200/1544745600

https://backpack.tf/profiles/76561198406773866#!/compare/1543449600/1543795200

Untrace

Sale 6:

https://backpack.tf/profiles/76561198142853906#!/compare/1544227200/1544918400

https://backpack.tf/profiles/76561197960958019#!/compare/1544054400/1544313600

Sold with ~48 keys in sweets for CPS Viewfinder

Use there

Sale 7:

https://backpack.tf/profiles/76561197960958019#!/compare/1544745600/1545004800

Sold for Scorching Bonnet

Bonnet Mini:

https://backpack.tf/suggestion/5c36544b44325a10ad77a730

Suggestion for 146 keys

Sale 8:

https://backpack.tf/profiles/76561198158210385#!/compare/1547078400/1547251200

Sold with 20 keys for Scorching Rotation

Rotation Mini:

https://backpack.tf/suggestion/5c48851a44325a5ba667fb22

Suggestion for 232.5 keys

Total is 212.5 keys

Sale 8:

https://marketplace.tf/items/30542;5;u14

Sold for 245 USD

Keys at 1.69 USD

Total is 144.97 keys

Given that both sales at ~145 took less than a week to sell, gonna argue that both don't represent a common trading point, given that the CPS viewfinder supports a higher price.

Taking 210 flat.