Sale 1:

https://backpack.tf/profiles/76561198153789411#!/compare/1568246400/1568332800

https://backpack.tf/profiles/76561198252999692#!/compare/1568160000/1568246400

Bulk

sale 2:

https://backpack.tf/profiles/76561198252999692#!/compare/1569369600/1569456000

https://backpack.tf/profiles/76561198307277233#!/compare/1569456000/1569542400

Sold for 8 keys

Sale 3:

https://backpack.tf/profiles/76561198797640005#!/compare/1565308800/1566691200

https://backpack.tf/profiles/76561198337734785#!/compare/1565222400/1565308800

QS

sale 4:

https://backpack.tf/profiles/76561198157064367#!/compare/1562716800/1567728000\

https://backpack.tf/profiles/76561198156494997#!/compare/1556150400/1564963200

Untrace

sale 5:

https://backpack.tf/profiles/76561198056059261#!/compare/1564358400/1564444800

https://backpack.tf/profiles/76561198312583107#!/compare/1564272000/1564444800

QS

Sale 6:

https://backpack.tf/profiles/76561198315588518#!/compare/1562976000/1563062400

https://backpack.tf/profiles/76561198056059261#!/compare/1563062400/1563321600

Keys

Sale 7:

https://backpack.tf/profiles/76561198160213398#!/compare/1564531200/1564617600

https://backpack.tf/profiles/76561198884518360#!/compare/1564272000/1564704000

SCM

Sale 8:

https://backpack.tf/profiles/76561198884518360#!/compare/1565222400/1565308800

https://backpack.tf/profiles/76561198121830870#!/compare/1565136000/1565222400

Sold for Smoking Handle

Handle Mini:

https://backpack.tf/suggestion/5d9ab20f67807256d12837c1

Suggestion for 8.25 keys

https://bot.tf/stats/listings/M1798GLO

B/O of 10 keys

Sale 9:

https://backpack.tf/profiles/76561198121830870#!/compare/1565568000/1565654400

https://backpack.tf/profiles/76561198832832186#!/compare/1565568000/1565654400

untrace

Sale 10:

https://backpack.tf/profiles/76561198832832186#!/compare/1566086400/1566172800

https://backpack.tf/profiles/76561198382290208#!/compare/1566086400/1566172800

QS

Sale 11:

https://backpack.tf/profiles/76561198210225228#!/compare/1566259200/1566345600

https://backpack.tf/profiles/76561198063809059#!/compare/1549411200/1568505600

Untrace

Sale 12:

https://backpack.tf/profiles/76561198063809059#!/compare/1568937600/1569369600

https://backpack.tf/profiles/76561198323565601#!/compare/1568851200/1568937600

QS

Sale 13 - 16:

https://marketplace.tf/items/tf2/340;5;u34

$21.85 / $1.83 = 11.94 keys

$16 / $1.82 = 8.79 keys

$17.27 / $1.82 = 9.49 keys

$16.95 / $1.81 = 9.36 keys

Total sales @:

8, 8.25, 8.79, 9.36, 9.49, 11.94 keys

seller for 8 keys only recently dropped, previously listed and unsold for 9 keys for more than a month:

https://bot.tf/stats/listings/4OV6Q3EW

https://bot.tf/stats/listings/YDLPXRV5

https://bot.tf/stats/listings/4EEKGLPE

https://bot.tf/stats/listings/MGZJJ893

calling 11.94 high,

taking 8 - 9.5 keys.