Challenge 19, Team F.L.A.M.B.E.S!

52nd suggestion, made by Mikey!

Sale 1:

https://marketplace.tf/items/tf2/403;5;u56

Can't find item history.

Apr 22nd - $13.09

Keys were $1.75 that day, so 13.09 / 1.75 = 7.5 keys.

Sale 2:

https://backpack.tf/profiles/76561198014326469#!/compare/1588377600/1588723200

https://backpack.tf/profiles/76561198344613501#!/compare/1588377600/1588723200

Sold for ~7 keys

Sale 3:

https://backpack.tf/profiles/76561198344613501#!/compare/1588723200/1588809600

https://backpack.tf/profiles/76561198018497391#!/compare/1588723200/1588809600

Untrace

Sale 4:

https://backpack.tf/profiles/76561198311498888#!/compare/1590624000/1590710400

https://backpack.tf/profiles/76561198405316403#!/compare/1590624000/1590710400

STN - Invalid.

Sale 5:

https://backpack.tf/profiles/76561198405316403#!/compare/1590710400/1590796800

https://backpack.tf/profiles/76561198822717876#!/compare/1588723200/1588809600

Sold for Aussie SMG(~7.5) + 1 key

Total is ~8.5 keys

Sale 6:

https://backpack.tf/profiles/76561198146784656#!/compare/1590710400/1590796800

https://backpack.tf/profiles/76561198259795031#!/compare/1590710400/1590796800

Untrace / Never shows up in either inventory: https://backpack.tf/item/7955943636

Sale 7:

https://backpack.tf/profiles/76561198259795031#!/compare/1590710400/1590883200

https://backpack.tf/profiles/76561198159656266#!/compare/1590710400/1590883200

Untrace

Sale 8:

https://backpack.tf/profiles/76561198159656266#!/compare/1590883200/1590969600

https://backpack.tf/profiles/76561198308772967#!/compare/1590883200/1590969600

7 keys + 20 refined, rounding to 7.5 keys.

Sale 9:

https://backpack.tf/profiles/76561198355796365#!/compare/1588377600/1588464000

https://backpack.tf/profiles/76561198197841087#!/compare/1587945600/1588464000

Untrace

Sale 10:

https://backpack.tf/profiles/76561198197841087#!/compare/1588464000/1588550400

https://backpack.tf/profiles/76561198012895150#!/compare/1584403200/1588550400

Untrace / never shows up, probably gambling. https://backpack.tf/item/4797445180

Sale 11:

https://backpack.tf/profiles/76561198012895150#!/compare/1588550400/1588636800

https://backpack.tf/profiles/76561199025023571#!/compare/1588550400/1588809600

Untrace / never shows up, probably gambling. https://backpack.tf/item/4797445180

Sale 12:

https://backpack.tf/profiles/76561199025023571#!/compare/1588723200/1588809600

https://backpack.tf/profiles/76561198054002248#!/compare/1588723200/1588809600

Untrace / never shows up, probably gambling. https://backpack.tf/item/4797445180

Sale 13:

https://backpack.tf/profiles/76561198054002248#!/compare/1588723200/1588809600

https://backpack.tf/profiles/76561199025023571#!/compare/1588723200/1588809600

Untrace / never shows up, probably gambling. https://backpack.tf/item/4797445180

Sale 14:

https://backpack.tf/profiles/76561199025023571#!/compare/1588896000/1588982400

https://backpack.tf/profiles/76561198067719183#!/compare/1588896000/1588982400

Untrace, probably gambling. https://backpack.tf/item/4797445180

Sale 15:

https://backpack.tf/profiles/76561198067719183#!/compare/1588896000/1589155200

https://backpack.tf/profiles/76561198020673987#!/compare/1588809600/1589155200

Untrace / Bulk

Sale 16:

https://backpack.tf/profiles/76561198020673987#!/compare/1589328000/1589500800

https://backpack.tf/profiles/76561198850178158#!/compare/1588809600/1589932800

Untrace

Sale 17:

https://backpack.tf/profiles/76561198422260378#!/compare/1588032000/1588636800

https://backpack.tf/profiles/76561198092472594#!/compare/1588550400/1588636800

Bulk / Untrace

Sale 18:

https://backpack.tf/profiles/76561198092472594#!/compare/1588636800/1588723200

https://backpack.tf/profiles/76561198285371555#!/compare/1588636800/1588723200

Untrace

Sale 19:

https://backpack.tf/profiles/76561198285371555#!/compare/1588636800/1588723200

https://backpack.tf/profiles/76561198020673987#!/compare/1588636800/1588809600

Bulk / Untrace

Sale 20:

https://backpack.tf/profiles/76561198020673987#!/compare/1588809600/1589155200

https://backpack.tf/profiles/76561198850274253#!/compare/1589068800/1589155200

Untrace

Sale 21:

https://backpack.tf/profiles/76561198850274253#!/compare/1589932800/1590019200

https://backpack.tf/profiles/76561198850178158#!/compare/1589932800/1590019200

Untrace

Sale 22:

https://backpack.tf/profiles/76561198850178158#!/compare/1592524800/1592611200

https://backpack.tf/profiles/76561198061353482#!/compare/1587513600/1592611200

Untrace

Sale 23:

https://backpack.tf/profiles/76561198061353482#!/compare/1592611200/1592870400

https://backpack.tf/profiles/76561198030214998#!/compare/1592524800/1592611200

Bulk / Gambling

Sale 24:

https://backpack.tf/profiles/76561198030214998#!/compare/1592611200/1592697600

https://backpack.tf/profiles/76561198135388328#!/compare/1592611200/1592697600

Scrap.tf trade - Invalid.

Sale 25:

https://backpack.tf/profiles/76561198135388328#!/compare/1592697600/1592784000

https://backpack.tf/profiles/76561198985910282#!/compare/1592697600/1592784000

Scrap.tf trade - Invalid.

Sale 26:

https://backpack.tf/profiles/76561198822717876#!/compare/1588723200/1588809600

https://backpack.tf/profiles/76561198018497391#!/compare/1588723200/1588809600

Sold for Aces Dragonborn(8.75)

Sale 27:

https://backpack.tf/profiles/76561198353389785#!/compare/1587945600/1588118400

https://backpack.tf/profiles/76561198337734785#!/compare/1588032000/1588118400

QS

sale 28:

https://backpack.tf/profiles/76561198337734785#!/compare/1591747200/1591833600

https://backpack.tf/profiles/76561198305494036#!/compare/1591747200/1591833600

Untrace

sale 29:

https://backpack.tf/profiles/76561198305494036#!/compare/1592611200/1592697600

https://backpack.tf/profiles/76561198079989349#!/compare/1592524800/1592697600

https://backpack.tf/profiles/76561198305494036#!/compare/1592611200/1592697600

tradeback for ~7 keys <--- IMPORTANT

Classifieds:

2 for sale @ 7 keys, <24 hour listings.

1 @ 8.37 keys, 27 days old

1 @ 10 keys, 2 months old

1 @ 10 keys, 4 days old

Summary of Sales:

1 @ 8.75 keys

1 @ 8.5 keys

2 @ 7.5 keys

given sellers for 7 keys,

and tradeback at 7 keys,

taking 7 - 8.5 keys.