Re-suggestion, thanks to Marty for the info!

Sale 1:

https://backpack.tf/profiles/76561198416081952#!/compare/1521417600/1521504000

Use on Searing rotation.

Sale 2:

https://backpack.tf/profiles/76561198088707185#!/compare/1524009600/1524268800

https://backpack.tf/profiles/76561198232041512#!/compare/1523923200/1524009600

Bulk(?)

Sale 3:

https://backpack.tf/profiles/76561198232041512#!/compare/1525132800/1525219200

https://backpack.tf/profiles/76561198353783512#!/compare/1525219200/1525305600

Sold for keys, untraceable.

Sale 4:

https://backpack.tf/profiles/76561198353783512#!/compare/1525219200/1525305600

https://backpack.tf/profiles/76561198425857649#!/compare/1525219200/1525305600

Use there.

Sale 5:

https://backpack.tf/profiles/76561198425857649#!/compare/1525651200/1525824000

https://backpack.tf/profiles/76561198050114720#!/compare/1525737600/1525824000

Sold for Burning Sky High + ~7 keys in sweets.

https://backpack.tf/suggestion/5ad3a38e44325a0cbb48b8f2

Suggestion for 66 keys

Taking 59 keys.

Sale 6:

https://backpack.tf/profiles/76561198050114720#!/compare/1525737600/1525824000

https://backpack.tf/profiles/76561198067055238#!/compare/1525737600/1525824000

Sold with TFL Shako + 1 key for DBD Cloak(95)

Shako Mini:

https://backpack.tf/profiles/76561198067055238#!/compare/1525824000/1525910400

Sold for 18 pure.

Total is 95 - 19 = 76 keys

Sale 7:

https://backpack.tf/profiles/76561198067055238#!/compare/1525910400/1526083200

https://backpack.tf/profiles/76561198107260155#!/compare/1525996800/1526083200

Sold for 2 keys + PF TC

TC Mini:

https://backpack.tf/profiles/76561198014564575#!/compare/1522972800/1523145600

https://backpack.tf/profiles/76561198104638778#!/compare/1523145600/1523232000

Sold for CH Pom-Pom(50) + 15.15 keys in sweets

Total is 65.15 keys.

Total is 63.15 keys

http://www.tf2outpost.com/trade/29647001

B/O of 60, capping.

Total sales @:

59, 60, 76.

https://i.imgur.com/PyNg6fz.jpg

Considering seller at 60, taking 59 - 60 keys.

Marty's part:

Sweets should have been subtracted in sale #5, not added. Meanwhile, current seller for 70: https://imgur.com/a/bhi2Nvw

I think sale #6 is just as much of an outlier as sale #4 here.