Sale 1:

https://backpack.tf/profiles/76561197993834789#!/compare/1583539200/1583798400

https://backpack.tf/profiles/76561198296495381#!/compare/1584144000/1584316800

SCM

sale 2:

https://backpack.tf/profiles/76561198296495381#!/compare/1584316800/1584576000

https://backpack.tf/profiles/76561198202186637#!/compare/1584316800/1585008000

Untrace

sale 3:

https://backpack.tf/profiles/76561198188639765#!/compare/1580860800/1580947200

https://backpack.tf/profiles/76561198840347736#!/compare/1580860800/1580947200

Sold for GE Warming + ~3 keys in sweets

use there, ends up low

Sale 4:

https://backpack.tf/profiles/76561198840347736#!/compare/1581120000/1581206400

https://backpack.tf/profiles/76561198026198026#!/compare/1581120000/1581206400

Sold with 2 keys for ~32 keys in Aussies

Total is 30 keys

Sale 5:

https://backpack.tf/profiles/76561198026198026#!/compare/1581552000/1581638400

https://backpack.tf/profiles/76561198061779536#!/compare/1581552000/1581638400

Bulk

sale 6:

https://backpack.tf/profiles/76561198295044680#!/compare/1585353600/1585612800

https://backpack.tf/profiles/76561198131588487#!/compare/1584835200/1585958400

Utnrace

sale 7:

https://backpack.tf/profiles/76561198447368420#!/compare/1581552000/1584835200

https://backpack.tf/profiles/76561198124458311#!/compare/1583712000/1584835200

Untrace

Sale 8:

https://backpack.tf/profiles/76561198109611180#!/compare/1584662400/1585699200

https://backpack.tf/profiles/76561198177872379#!/compare/1584576000/1584662400

untrace

Sale 9:

https://backpack.tf/profiles/76561198177872379#!/compare/1585008000/1585094400

https://backpack.tf/profiles/76561198172820673#!/compare/1585094400/1585180800

Untrace

sale 10:

https://backpack.tf/profiles/76561198063640894#!/compare/1583539200/1583625600

https://backpack.tf/profiles/76561198436103721#!/compare/1582934400/1583625600

Sold for 27 keys

https://backpack.tf/classifieds?item=Blitzkrieg%20|%20Knife%20(Field-Tested)&quality=15&tradable=1&craftable=1&australium=-1&particle=701&killstreak_tier=0

Buyers up to 20 keys

Taking 27 - 30 keys