Sale 1&2:

https://marketplace.tf/items/tf2/30618;5;u3024

$19 / $1.68 = 11.31 keys // https://backpack.tf/item/6095915407

$16.04 / $1.69 = 9.49 keys // https://backpack.tf/item/4409218794

Sale 3:

SCM

https://backpack.tf/profiles/76561198081925059#!/compare/1580860800/1580947200

https://backpack.tf/profiles/76561198014728963#!/compare/1580256000/1580342400

Sale 4:

bulk

https://backpack.tf/profiles/76561198084367252#!/compare/1586390400/1586476800

https://backpack.tf/profiles/76561198819747735#!/compare/1586390400/1586476800

Sale 5:

untrace

https://backpack.tf/profiles/76561198099260958#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198053720151#!/compare/1585267200/1585353600

Sale 6:

bulk

https://backpack.tf/profiles/76561198077870175#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198053720151#!/compare/1585267200/1585353600

Sale 7:

sold with Winter Spirit Yeti Punch for 20 pure

https://backpack.tf/profiles/76561198077870175#!/compare/1585612800/1585699200

https://backpack.tf/profiles/76561198113899098#!/compare/1585612800/1585699200

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

although this is kinda close to buy orders there are 3 sales around 9-11 keys if you include sale 7 so its a common trading point

also took a month to sell at 11 keys so not a qs