Sale 1:

https://backpack.tf/profiles/76561198248576070#!/compare/1634947200/1635206400

https://backpack.tf/profiles/76561198080179568#!/compare/1635120000/1635206400

transfer

Sale 2:

https://backpack.tf/profiles/76561198080179568#!/compare/1635206400/1635292800

https://backpack.tf/profiles/76561198453530349#!/compare/1635206400/1635292800

~ 11 keys

Sale 3:

https://backpack.tf/profiles/76561198453530349#!/compare/1637539200/1637625600

https://backpack.tf/profiles/76561198162659711#!/compare/1637625600/1637712000

~ 11 keys

Sale 4:

https://backpack.tf/profiles/76561198162659711#!/compare/1637625600/1637712000

https://backpack.tf/profiles/76561199104474431#!/compare/1637625600/1637712000

untrace

Sale 5:

https://backpack.tf/profiles/76561199104474431#!/compare/1637712000/1637798400

https://backpack.tf/profiles/76561199010987801#!/compare/1637798400/1637884800

untrace possibly gambled

Sale 6:

https://backpack.tf/profiles/76561199010987801#!/compare/1637712000/1637798400

https://backpack.tf/profiles/76561198110534225#!/compare/1637712000/1637798400

bulk

Sale 7:

https://backpack.tf/profiles/76561198110534225#!/compare/1638144000/1638403200

https://backpack.tf/profiles/76561198218108539#!/compare/1638403200/1638489600

untrace

Sale 8:

https://backpack.tf/profiles/76561199139031975#!/compare/1638316800/1638403200

https://backpack.tf/profiles/76561198218108539#!/compare/1638316800/1638403200

gambled

Sale 9:

https://backpack.tf/profiles/76561198203129156#!/compare/1618185600/1634601600

https://backpack.tf/profiles/76561199085116273#!/compare/1634515200/1634601600

untrace

Sale 10:

https://backpack.tf/profiles/76561199085116273#!/compare/1637625600/1637712000

https://backpack.tf/profiles/76561198153225775#!/compare/1637625600/1637712000

~ 12 keys

Sale 11:

https://backpack.tf/profiles/76561198153225775#!/compare/1637798400/1637884800

https://backpack.tf/profiles/76561198277409359#!/compare/1637798400/1637884800

12 keys

Sale 12:

https://backpack.tf/profiles/76561198277409359#!/compare/1637884800/1637971200

https://backpack.tf/profiles/76561198140253855#!/compare/1637798400/1637971200

Frightened Poltergeist Fly guy + 2 keys

Fly Guy mini:

https://backpack.tf/profiles/76561198049857603#!/compare/1637712000/1637798400

https://backpack.tf/profiles/76561198140253855#!/compare/1637712000/1637798400

15 keys flat + 2 keys = 17

Sale 13:

https://backpack.tf/profiles/76561198140253855#!/compare/1637971200/1638057600

https://backpack.tf/profiles/76561198380634252#!/compare/1637884800/1638057600

Putrescent pigmentation + Team Spirit FP lone star

Lone star mini:

https://backpack.tf/profiles/76561198380634252#!/compare/1636675200/1636761600

https://backpack.tf/profiles/76561199078694718#!/compare/1636675200/1637193600

6 keys

Sales:

6, 11, 11, 12, 12, 17

Counting 6 and 17 as an outlier, so taking 11 - 12 keys flat