Item 1

https://backpack.tf/item/12756506235

(PS the inventories are NSFW)

https://backpack.tf/profiles/76561198080812606#!/compare/1717372800/1717459200

https://backpack.tf/profiles/76561198362864785#!/compare/1717372800/1717459200

Bulk, not usuable

Item 2

https://backpack.tf/item/12251255368

https://backpack.tf/profiles/76561198850274253#!/compare/1722556800/1722643200

https://backpack.tf/profiles/76561198069762729#!/compare/1722470400/1722643200

21 keys + Gaelic Glutton (54.44 Ref) + The Level Three Chin (15.22 Ref) + Terror-antula (36.33 Ref) + Killstreak Festive Black Box (1.27 keys)

Say 24 keys

Item 3

https://backpack.tf/item/12243012108

Sale 1

https://backpack.tf/profiles/76561198393596975#!/compare/1725494400/1725580800

https://backpack.tf/profiles/76561199564942025#!/compare/1725580800/1725667200

Untraced

Sale 2

https://backpack.tf/profiles/76561199564942025#!/compare/1725580800/1725667200

https://backpack.tf/profiles/76561198976371399#!/compare/1725494400/1725840000

23 keys removed but not going to the seller inventory, not used

Item 4

https://backpack.tf/item/12232492709

https://backpack.tf/profiles/76561198964799051#!/compare/1722729600/1722902400

https://backpack.tf/profiles/76561199389372563#!/compare/1722816000/1722902400

Bulk

Item 5

https://backpack.tf/item/12203824149

https://backpack.tf/profiles/76561199202848205#!/compare/1726185600/1726272000

https://backpack.tf/profiles/76561198947909163#!/compare/1721952000/1726617600

untraced

Item 6

https://backpack.tf/item/12185773393

ID 14927941993

https://backpack.tf/profiles/76561198062747535#!/compare/1726704000/1726876800

https://backpack.tf/profiles/76561199620388738#!/compare/1726790400/1726876800

18 keys + negligible metal

Item 7

https://backpack.tf/item/14676973705

https://backpack.tf/profiles/76561198300091943#!/compare/1722297600/1726963200

https://backpack.tf/profiles/76561198017294844#!/compare/1720828800/1722384000

Untraced

Item 8

https://backpack.tf/item/14351881116

https://backpack.tf/profiles/76561199581722058#!/compare/1721174400/1721260800

https://backpack.tf/profiles/76561198100101202#!/compare/1721088000/1721260800

Untraced

Item 9

https://backpack.tf/item/14142028645

https://backpack.tf/profiles/76561198244962432#!/compare/1716940800/1717027200

https://backpack.tf/profiles/76561198116184902#!/compare/1717027200/1717113600

Counted 16 keys

Item 10

https://backpack.tf/item/13159817726

https://backpack.tf/profiles/76561198311498888#!/compare/1721865600/1721952000

https://backpack.tf/profiles/76561198067931610#!/compare/1718668800/1724025600

Untraced

MP.tf

https://marketplace.tf/items/tf2/31304;5;u266

Jul - Sep

3 @ 29.95

4 @ 40

(40  ÷  1.7  +  40  ÷  1.74  +  29.95  ÷  1.75  +  29.95  ÷  1.81  +  29.95  ÷  1.84  +  40  ÷  1.87  +  39.99  ÷  1.88) / 7 = 19.87 keys

Average to 20 keys

1 @ 16

1 @ 18

7 @ 20

1 @ 24