Sale 1:

according to bot.tf this is 12 keys: https://bot.tf/stats/item?def=30336&q=5&ef=Miami%20Nights&craft=1 / https://imgur.com/a/alNiXcP

however only 7 keys histories match, if you take this as 12 keys then it fits in the range and if you take this as 7 keys then its under buyers and excluded anyway

buyers at 8 keys: https://imgur.com/a/L7xFlr9

https://backpack.tf/profiles/76561198341171690#!/compare/1572048000/1572134400

https://backpack.tf/profiles/76561198169130112#!/compare/1570838400/1572566400

Sale 2:

untrace

https://backpack.tf/profiles/76561198180836158#!/compare/1572307200/1572393600

https://backpack.tf/profiles/76561198845407723#!/compare/1572307200/1572393600

Sale 3:

untrace

https://backpack.tf/profiles/76561198845407723#!/compare/1572307200/1572393600

https://backpack.tf/profiles/76561198388910607#!/compare/1572307200/1572393600

Sale 4:

untrace

https://backpack.tf/profiles/76561198388910607#!/compare/1572652800/1572739200

https://backpack.tf/profiles/76561198123271612#!/compare/1572652800/1572739200

Sale 5:

10 keys

with small sweets for Roaring Rockets Taunt: Pool Party(10)

https://backpack.tf/profiles/76561198123271612#!/compare/1573430400/1573516800

https://backpack.tf/profiles/76561198072439676#!/compare/1572566400/1573516800

pool party: https://backpack.tf/suggestion/5e1bdaba78464927f82017c4

Sale 6:

bulk

https://backpack.tf/profiles/76561198072439676#!/compare/1574208000/1574294400

https://backpack.tf/profiles/76561198122604075#!/compare/1574208000/1574294400

Sale 7:

12 keys

https://backpack.tf/profiles/76561198334598690#!/compare/1575586800/1575673200

buyers bp doesnt load: https://backpack.tf/profiles/76561197960343543

you can see the keys came from this user and the unusual is in his steam inv:

https://steamcommunity.com/id/the_legion/inventory/

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

Sales:

10,12,(12?)