Update!

Sale 1: https://backpack.tf/profiles/76561198026526425#!/compare/1590278400/1590364800

https://backpack.tf/profiles/76561198092449612#!/compare/1590192000/1590278400

?

Sale 2: https://backpack.tf/profiles/76561198092449612#!/compare/1590278400/1590537600

https://backpack.tf/profiles/76561198082465971#!/compare/1551312000/1590451200

?

Sale 3: https://backpack.tf/profiles/76561198082465971#!/compare/1590451200/1590537600

https://backpack.tf/profiles/76561198063536945#!/compare/1588118400/1590537600

41 pure.

Sale 4: https://backpack.tf/profiles/76561198063536945#!/compare/1590537600/1590624000

https://backpack.tf/profiles/76561198078018027#!/compare/1590537600/1590624000

?

Sale 5: https://backpack.tf/profiles/76561198078018027#!/compare/1590624000/1590710400

https://backpack.tf/profiles/76561198012537041#!/compare/1590624000/1590710400

?

Sale 6: https://backpack.tf/profiles/76561198012537041#!/compare/1590796800/1590883200

https://backpack.tf/profiles/76561198106425214#!/compare/1590796800/1590883200

?

Sale 7: https://backpack.tf/profiles/76561198106425214#!/compare/1590883200/1590969600

https://backpack.tf/profiles/76561197990636402#!/compare/1590883200/1590969600

?

Sale 8: https://backpack.tf/profiles/76561197990636402#!/compare/1590969600/1591056000

https://backpack.tf/profiles/76561198012537041#!/compare/1590883200/1590969600

?

Sale 9: https://backpack.tf/profiles/76561198012537041#!/compare/1590969600/1591056000

https://backpack.tf/profiles/76561198072374854#!/compare/1590105600/1591056000

?

Sale 10: https://backpack.tf/profiles/76561198092382473#!/compare/1591315200/1591401600

https://backpack.tf/profiles/76561198068732040#!/compare/1591401600/1591488000

?

Sale 11: https://backpack.tf/profiles/76561198068732040#!/compare/1591401600/1591488000

https://backpack.tf/profiles/76561198089253101#!/compare/1591315200/1591401600

?

Sale 12: https://backpack.tf/profiles/76561198089253101#!/compare/1591315200/1591401600

https://backpack.tf/profiles/76561198820335875#!/compare/1591315200/1591401600

?

Sale 13: https://backpack.tf/profiles/76561198820335875#!/compare/1591401600/1591574400

https://backpack.tf/profiles/76561198036511368#!/compare/1590364800/1591401600

?

Sale 14: https://backpack.tf/profiles/76561198036511368#!/compare/1591574400/1591660800

https://backpack.tf/profiles/76561198183424550#!/compare/1591574400/1591660800

?

Sale 15: https://backpack.tf/profiles/76561198183424550#!/compare/1592697600/1592784000

https://backpack.tf/profiles/76561198030214998#!/compare/1592697600/1592784000

?

Sale 16: https://backpack.tf/profiles/76561198030214998#!/compare/1592784000/1592870400

https://backpack.tf/profiles/76561198269337198#!/compare/1592784000/1592870400

?

Sale 17: https://backpack.tf/profiles/76561198269337198#!/compare/1592870400/1592956800

https://backpack.tf/profiles/76561198072898758#!/compare/1592784000/1592956800

?

Sale 18: https://backpack.tf/profiles/76561198072898758#!/compare/1592956800/1593129600

https://backpack.tf/profiles/76561198869102869#!/compare/1592784000/1592956800

?

Sale 19: https://backpack.tf/profiles/76561198869102869#!/compare/1592956800/1593043200

https://backpack.tf/profiles/76561198269337198#!/compare/1592956800/1593043200

?

Sale 20: https://backpack.tf/profiles/76561198269337198#!/compare/1592956800/1593043200

https://backpack.tf/profiles/76561198081962061#!/compare/1592956800/1593043200

?

Sale 21: https://backpack.tf/profiles/76561198081962061#!/compare/1593561600/1593734400

https://backpack.tf/profiles/76561198030214998#!/compare/1593561600/1593648000

?

Sale 22: https://backpack.tf/profiles/76561198030214998#!/compare/1593648000/1593734400

https://backpack.tf/profiles/76561198294426922#!/compare/1593648000/1593734400

?

Sale 23: https://backpack.tf/profiles/76561198061108999#!/compare/1592956800/1593043200

https://backpack.tf/profiles/76561198208212125#!/compare/1592784000/1593302400

Sold for a Haunted Ghosts Backwards Ballcap (48 keys) + ~5 keys in adds.

48 + 5 = 53

Sale 24: https://backpack.tf/profiles/76561198208212125#!/compare/1593302400/1593648000

https://backpack.tf/profiles/76561198088775634#!/compare/1593561600/1593734400

Sold for a Haunted Ghosts Dark Falkirk Helm (36 keys) + 1 key

36 + 1 = 37

mp.tf sales: https://marketplace.tf/items/tf2/30307;5;u19

50/1.99 = ~25

60/1.99 = ~30

66.67/1.99 = ~34

Sales: 25, 30, 34, 37, 41 and 53. Classies: https://i.imgur.com/H2FDusI.png. Taking 30-41.