Complete suggestion was made by scourge, don't know why he wanted me to post xd

Sale 1: ~18 Keys Pure.

https://backpack.tf/profiles/76561198166670575#!/compare/1552780800/1552867200

https://backpack.tf/profiles/76561198047263033#!/compare/1552780800/1552867200

Sale 2: ~13 Keys.

https://backpack.tf/profiles/76561198047263033#!/compare/1554508800/1554595200

https://backpack.tf/profiles/76561198052582902#!/compare/1553731200/1555200000

Sold for Collector Huntsman(13)

Sale 3:

https://backpack.tf/profiles/76561198080799398#!/compare/1548374400/1555632000

https://backpack.tf/profiles/76561198140316312#!/compare/1555545600/1555632000

Bulk

Sale 4:

https://backpack.tf/profiles/76561198140316312#!/compare/1555545600/1555632000

https://backpack.tf/profiles/76561198047556217#!/compare/1555372800/1556064000

Untrace

Sale 5:

https://backpack.tf/profiles/76561198064569267#!/compare/1555977600/1556064000

https://backpack.tf/profiles/76561198416664283#!/compare/1555804800/1556064000

Bulk(?)

Sale 6:

https://backpack.tf/profiles/76561198416664283#!/compare/1558742400/1558828800

https://backpack.tf/profiles/76561198093707809#!/compare/1558742400/1558828800

Untrace

Sale 7:

https://backpack.tf/profiles/76561198078285016#!/compare/1554422400/1554508800

https://backpack.tf/profiles/76561198154211785#!/compare/1554422400/1554508800

Bulk

Sale 8:

https://backpack.tf/profiles/76561198154211785#!/compare/1554595200/1554681600

https://backpack.tf/profiles/76561198220612564#!/compare/1554595200/1554681600

Sold for 24 keys

Sale 9:

https://backpack.tf/profiles/76561198220612564#!/compare/1555718400/1555804800

https://backpack.tf/profiles/76561198046921199#!/compare/1555718400/1555804800

Bulk

Sale 10:

https://backpack.tf/profiles/76561198046921199#!/compare/1555804800/1555891200

https://backpack.tf/profiles/76561198030343929#!/compare/1555804800/1555891200

Sold for 14 keys

MPTF:

https://marketplace.tf/items/1092;14

$80.00 / $1.79 = 44.69 keys

https://marketplace.tf/items/1092;14;kt-3

$48.00 / $1.8 = 26.67 keys

$79.99 / $1.79 = 44.69 keys

Buy order

Sales 13/14/18/24/27/45/45

13/14 bellow buyers

Seller at 25 keys for pro ks one

Going with 18-24 (Thanks to all the ppl that helped to get this range)