Sale 1:

https://backpack.tf/profiles/76561198122599533#!/compare/1567036800/1567814400

https://backpack.tf/profiles/76561198122599533#!/compare/1567036800/1567814400

Untrace

Sale 2:

https://backpack.tf/profiles/76561198046393528#!/compare/1566777600/1566864000

https://backpack.tf/profiles/76561198824443316#!/compare/1566777600/1566864000

https://backpack.tf/profiles/76561198004421274#!/compare/1566864000/1566950400

https://backpack.tf/profiles/76561198032717076#!/compare/1566777600/1566864000

Untrace

Sale 3:

https://backpack.tf/profiles/76561198032717076#!/compare/1567036800/1567209600

https://backpack.tf/profiles/76561198194358278#!/compare/1566086400/1567123200

https://backpack.tf/profiles/76561198002757046#!/compare/1567036800/1567123200

Untrace then QS

sale 4:

https://backpack.tf/profiles/76561198032717076#!/compare/1567036800/1567209600

https://backpack.tf/profiles/76561198194358278#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198002757046#!/compare/1567036800/1567123200

Untrace

Sale 5:

https://backpack.tf/profiles/76561198201385195#!/compare/1566777600/1566864000

https://backpack.tf/profiles/76561198798948734#!/compare/1566691200/1566864000

Can trace 2 keys

Sale 6:

https://backpack.tf/profiles/76561198798948734#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198085187877#!/compare/1567123200/1567209600

sold with ~2.5 keys in sweets for TW Topi

Topi Mini:

https://backpack.tf/suggestion/5dabe0e5d38172541f23005c

Suggestion for 8.5 keys

Total is 6 keys

Sale 7:

https://backpack.tf/profiles/76561198085187877#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198044344440#!/compare/1567123200/1567209600

Untrace

sale 8:

https://backpack.tf/profiles/76561198044344440#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198279539667#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198069580305#!/compare/1567296000/1567987200

https://backpack.tf/profiles/76561198074718149#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561197970562873#!/compare/1567814400/1568073600

https://backpack.tf/profiles/76561198822711927#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561198089253101#!/compare/1567987200/1568073600

Untrace

Sale 9:

https://backpack.tf/profiles/76561198101300189#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198154782261#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198101300189#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198058349418#!/compare/1566432000/1566518400

https://backpack.tf/profiles/76561198058349418#!/compare/1566432000/1566518400

https://backpack.tf/profiles/76561198110011480#!/compare/1566432000/1566518400

https://backpack.tf/profiles/76561198037782799#!/compare/1566518400/1566604800

https://backpack.tf/profiles/76561198323565601#!/compare/1566518400/1566604800

untrace

sale 10:

https://backpack.tf/profiles/76561198089253101#!/compare/1566691200/1566777600

https://backpack.tf/profiles/76561198273865118#!/compare/1566691200/1566777600

Untrace

sale 11:

https://marketplace.tf/items/tf2/246;5;u34

$14 / $1.83 = 7.65 keys

$14 / $1.83 = 7.65 keys

$14 / $1.82 = 7.69 keys

$17.98 / $1.83 = 9.83 keys

$14 / $1.83 = 7.65 keys

$12.92 / $1.83 = 7.06 keys

$12.92 / $1.83 = 7.06 keys

Total sales @:

6, 7, 7, 7.5, 7.5, 7.5, 7.5, 10 keys

buyers above 6 keys,

multiple sellers for 7 keys,

taking 7 - 7.5 keys.