All credits to tf2scourge

Sale 1:

https://backpack.tf/profiles/76561198075259330#!/compare/1541548800/1542240000

https://backpack.tf/profiles/76561198251704884#!/compare/1541635200/1541721600

Sold with Unusual GL BS for Blizzardy BoA

Nothing on the GL

Sale 2:

https://backpack.tf/profiles/76561198022806102#!/compare/1543190400/1543276800

https://backpack.tf/profiles/76561198060705509#!/compare/1543190400/1543276800

Sold for Aces Brim(15.5) + DP Yellow Belt(17.5) + Isotope MW D&A Degreaser +~2 keys in sweets

Nothing on the Degreaser

Sale 3:

https://backpack.tf/profiles/76561198060705509#!/compare/1543276800/1543536000

https://backpack.tf/profiles/76561198310972287#!/compare/1543449600/1543536000

Sold for 30 pure

Sale 4:

https://backpack.tf/profiles/76561198310972287#!/compare/1543622400/1543708800

https://backpack.tf/profiles/76561198052246700#!/compare/1543622400/1543708800

Can only trace a few keys

Sale 5:

https://backpack.tf/profiles/76561198052246700#!/compare/1543622400/1543708800

https://backpack.tf/profiles/76561198074178367#!/compare/1543622400/1543708800

Sold for Darkblaze Strontium

Strontium Mini:

https://backpack.tf/suggestion/5c205f48cf6c7539ab230d29

Suggestion for 49 keys

Sale 6:

https://backpack.tf/profiles/76561198074178367#!/compare/1543622400/1543708800

https://backpack.tf/profiles/76561198115699456#!/compare/1543622400/1543708800

Sold with ~10 keys in sweets for Demonflame Ushanka

Ushanka Mini:

https://backpack.tf/suggestion/5c206d4acf6c7545b06adf65

Suggestion for 73.5

Sale 7:

https://backpack.tf/profiles/76561198115699456#!/compare/1543968000/1544054400

https://backpack.tf/profiles/76561198092472594#!/compare/1543968000/1544054400

Sold for Surge Razor + 20 keys + ~6 keys in sweets

Razor Mini:

https://backpack.tf/suggestion/5c2048ad44325a49c04c6165#comment-5c204fffcf6c752cfc308ae4

Suggestion for 59 keys

Total is 85 keys

Sale 8:

https://backpack.tf/profiles/76561198092472594#!/compare/1543968000/1544054400

https://backpack.tf/profiles/76561198048140234#!/compare/1544054400/1544140800

Untrace

Sales at: 30, 49, 63.5, 85

Sale 1 would probably be around 35ish, sale 2 would likely be around 60, these suggest that 30 would be low, but 85 will be high

Going with the sales at 49 and 63.5 and establishing a range of 50-65 rounded, this sorta represents the midrange of the sales here.