Sale 1:

https://backpack.tf/profiles/76561198447257724#!/compare/1586908800/1587081600

https://backpack.tf/profiles/76561198252434508#!/compare/1586217600/1587081600

Sold for ~7 keys

sale 2:

https://backpack.tf/profiles/76561198252434508#!/compare/1587081600/1587168000

https://backpack.tf/profiles/76561198307219602#!/compare/1586995200/1587081600

untrace

sale 3:

https://backpack.tf/profiles/76561198307219602#!/compare/1587081600/1587168000

https://backpack.tf/profiles/76561198353374351#!/compare/1586995200/1587081600

Untrace

sale 4:

https://backpack.tf/profiles/76561198353374351#!/compare/1587081600/1587168000

https://backpack.tf/profiles/76561198271040599#!/compare/1549584000/1587168000

Sold with negligible sweets for 9 keys

sale 5:

https://backpack.tf/profiles/76561198271040599#!/compare/1587168000/1587254400

https://backpack.tf/profiles/76561198360076847#!/compare/1587168000/1587254400

Untrace

sale 6:

https://backpack.tf/profiles/76561198360076847#!/compare/1587168000/1587254400

https://backpack.tf/profiles/76561198053787974#!/compare/1548806400/1587254400

Sold for Blizzardy Topi

Topi Mini:

https://backpack.tf/suggestion/5ea4c5643167965ce127bdfc

suggestion for 8 keys

Sale 7:

https://backpack.tf/profiles/76561198053787974#!/compare/1587513600/1587600000

https://backpack.tf/profiles/76561198850274253#!/compare/1587513600/1587600000

QS

sale 8:

https://backpack.tf/profiles/76561198850274253#!/compare/1587600000/1587686400

https://backpack.tf/profiles/76561198095697847#!/compare/1587600000/1587686400

Sold with ~0.5 keys in sweets for 10 keys

Total is ~9.5 keys

Sale 9:

https://backpack.tf/profiles/76561198834493948#!/compare/1580428800/1580688000

https://backpack.tf/profiles/76561198170328895#!/compare/1580601600/1580688000

Sold for ~8 keys

sale 10:

https://backpack.tf/profiles/76561198170328895#!/compare/1581724800/1581811200

https://backpack.tf/profiles/76561198841279602#!/compare/1581638400/1581724800

QS

sale 11:

https://backpack.tf/profiles/76561198841279602#!/compare/1583798400/1583884800

https://backpack.tf/profiles/76561198124037843#!/compare/1575417600/1583971200

Sold for ~9 keys

Sale 12:

https://backpack.tf/profiles/76561198124037843#!/compare/1583971200/1584057600

https://backpack.tf/profiles/76561198305494036#!/compare/1583884800/1583971200

QS

Sale 13:

https://backpack.tf/profiles/76561198305494036#!/compare/1583971200/1584057600

https://backpack.tf/profiles/76561198850274253#!/compare/1584489600/1584576000

QS

sale 14:

https://backpack.tf/profiles/76561198850274253#!/compare/1584835200/1584921600

https://backpack.tf/profiles/76561198239405074#!/compare/1584835200/1584921600

Keys

sale 15:

https://backpack.tf/profiles/76561198315144952#!/compare/1581465600/1585699200

https://backpack.tf/profiles/76561198186297679#!/compare/1585699200/1585785600

Untrace

sale 16:

https://backpack.tf/profiles/76561198144820745#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198061671352#!/compare/1585267200/1585353600

Sold for Steaming Tyrannus

use there, few sales

Sale 17:

https://backpack.tf/profiles/76561198061671352#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198125791160#!/compare/1585267200/1585353600

Sold with ~1 key in sweets for Steaming Toy Soldier

use there, few sales

sale 18:

https://backpack.tf/profiles/76561198850274253#!/compare/1580860800/1580947200

https://backpack.tf/profiles/76561198368615541#!/compare/1580860800/1580947200

Sold for 8 keys

sale 19:

https://backpack.tf/profiles/76561198368615541#!/compare/1581206400/1581292800

https://backpack.tf/profiles/76561198113889163#!/compare/1581120000/1581292800

Sold for Smoking Coupe + 3 keys

Coupe can't be made:

https://pastebin.com/TWNVRmAR

sale 20:

https://backpack.tf/profiles/76561198113889163#!/compare/1581638400/1581724800

https://backpack.tf/profiles/76561198379996789#!/compare/1581638400/1581724800

sold with ~4 keys in sweets for Planets Capper

sale 21:

https://backpack.tf/profiles/76561198379996789#!/compare/1581638400/1581724800

https://backpack.tf/profiles/76561198209640976#!/compare/1581638400/1581724800

Sold with negligible sweets for.... something. Spiky, maybe? can't accurately tell...

Sale 22:

https://backpack.tf/profiles/76561198209640976#!/compare/1583539200/1583625600

https://backpack.tf/profiles/76561198263272395#!/compare/1583625600/1584144000

Untrace

sale 23:

https://backpack.tf/profiles/76561198263272395#!/compare/1583625600/1584144000

https://backpack.tf/profiles/76561198125791160#!/compare/1585267200/1585353600

Untrace

Total sales @:

7, 8, 8, 8, 9, 9, 9.5 keys

buyers up to ~7.5 keys,

taking 8 - 9.5 keys