Sale 1:

https://backpack.tf/profiles/76561198085880346#!/compare/1566086400/1566172800

https://backpack.tf/profiles/76561198048851745#!/compare/1566086400/1566172800

QS

Sale 2:

https://backpack.tf/profiles/76561198048851745#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198129309685#!/compare/1571961600/1572048000

Sold for ~7.5 keys

sale 3:

https://backpack.tf/profiles/76561198129309685#!/compare/1572048000/1572134400

https://backpack.tf/profiles/76561198323565601#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198089253101#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198012913578#!/compare/1571875200/1572048000

https://backpack.tf/profiles/76561198121830870#!/compare/1572134400/1572048000

QS then gambled then QS

sale 4:

https://backpack.tf/profiles/76561198063050690#!/compare/1569283200/1569974400

https://backpack.tf/profiles/76561198838281599#!/compare/1572652800/1573603200

https://backpack.tf/profiles/76561198390501419#!/compare/1572566400/1572652800

Untrace

sale 5:

https://backpack.tf/profiles/76561198361315298#!/compare/1566000000/1566345600

https://backpack.tf/profiles/76561198159317851#!/compare/1566172800/1566259200

Untrace

sale 6:

https://backpack.tf/profiles/76561198159317851#!/compare/1566172800/1566259200

https://backpack.tf/profiles/76561198189381361#!/compare/1566172800/1566259200

Bulky

sale 7:

https://backpack.tf/profiles/76561198189381361#!/compare/1568592000/1568678400

https://backpack.tf/profiles/76561198097271466#!/compare/1568505600/1568678400

Sold for 8 keys

sale 8:

https://backpack.tf/profiles/76561198097271466#!/compare/1572048000/1572134400

https://backpack.tf/profiles/76561198099132915#!/compare/1572048000/1572134400

Sold for ~7 keys?

sale 9:

https://backpack.tf/profiles/76561198099132915#!/compare/1572220800/1572307200

https://backpack.tf/profiles/76561198323565601#!/compare/1572220800/1572307200

QS

sale 10:

https://backpack.tf/profiles/76561198106594783#!/compare/1566777600/1566864000

https://backpack.tf/profiles/76561198453530349#!/compare/1566777600/1566864000

QS

sale 11:

https://backpack.tf/profiles/76561198453530349#!/compare/1568764800/1568851200

https://backpack.tf/profiles/76561198050518375#!/compare/1568764800/1568851200

Sold for 8 keys

sale 12:

https://backpack.tf/profiles/76561198211167524#!/compare/1568332800/1569196800

https://backpack.tf/profiles/76561198323565601#!/compare/1569110400/1569196800

QS

Sale 13:

https://backpack.tf/profiles/76561198089253101#!/compare/1570838400/1570924800

https://backpack.tf/profiles/76561198880384227#!/compare/1570406400/1571011200

Bulk

sale 14:

https://backpack.tf/profiles/76561198119153879#!/compare/1572134400/1572220800

https://backpack.tf/profiles/76561198105291975#!/compare/1572134400/1572220800

https://backpack.tf/profiles/76561198929605755#!/compare/1572220800/1572652800

https://backpack.tf/profiles/76561198191624677#!/compare/1572134400/1572220800

Gambling

sale 15:

https://backpack.tf/profiles/76561198191624677#!/compare/1572825600/1572912000

https://backpack.tf/profiles/76561198974218856#!/compare/1566259200/1572912000

Bulk

sale 16:

https://backpack.tf/profiles/76561198974218856#!/compare/1572912000/1573344000

https://backpack.tf/profiles/76561198323565601#!/compare/1573257600/1573344000

Untrace

sale 17:

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

https://backpack.tf/profiles/76561198046393528#!/compare/1566691200/1566777600

https://backpack.tf/profiles/76561198063803737#!/compare/1566691200/1566777600'

https://backpack.tf/profiles/76561198824443316#!/compare/1566691200/1566777600

https://backpack.tf/profiles/76561198102670784#!/compare/1566518400/1566950400

Gambling

sale 18:

https://backpack.tf/profiles/76561198075555852#!/compare/1556582400/1565913600

https://backpack.tf/profiles/76561198121796119#!/compare/1564099200/1568419200

Untrace

Sale 19:

https://marketplace.tf/items/tf2/384;5;u60

$21.69 / $1.79 = 12.12 keys

https://backpack.tf/item/7957405890

Total sales @:

7, 7.5, 8, 8, 12 keys

buyers up to 7 keys,

seller for 10 keys,

lets take 7.5 - 8 keys.