Sale 1-5:

https://marketplace.tf/items/30964;5;u18

$17 / $1.78 = 9.55 keys [ Excluding as $2 from buyers and could be a quicksell by "miauw csgofast.com": https://backpack.tf/item/6574595877 ]

$15 / $1.72 = 8.72 keys [ Excluding as under buyers: https://imgur.com/a/evleMKP ]

$19.99 / $1.72 = 11.62 keys

$24.68 / $1.65 = 14.96 keys

$23.68 / $1.79 = 13.23 keys

Sale 6:

untrace

https://backpack.tf/profiles/76561198337734785#!/compare/1541894400/1541980800

https://backpack.tf/profiles/76561198142939804#!/compare/1541635200/1541980800

Sale 7:

untrace

https://backpack.tf/profiles/76561198337734785#!/compare/1543017600/1543104000

https://backpack.tf/profiles/76561198035530455#!/compare/1529107200/1543190400

Sale 8:

12 keys

Sold with Gift Bringer(32 ref) for Pro KS Aussie Force-A-Nature(13 keys)

https://backpack.tf/profiles/76561198330302873#!/compare/1540771200/1540857600

https://backpack.tf/profiles/76561198184969761#!/compare/1540771200/1540857600

Force-A-Nature: https://imgur.com/a/EsaAxop

============================

Sales: 12,12,13,15