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

32nd suggestion, made by Mikey!

Sale 1:

https://marketplace.tf/items/tf2/1116;5;u3015

Can't find item history.

June 1st - $28.00

Keys were $1.92 that day, so 28 / 1.92 = 14.6 keys, rounding to 15.

Sale 2:

https://marketplace.tf/items/tf2/1116;5;u3015

Can't find item history.

June 10th - $14.00

Keys were $2.01 that day, so 14 / 2.01 = 6.97 keys, rounding to 7.

Sale 3:

https://backpack.tf/profiles/76561198839317660#!/compare/1587081600/1587168000

https://backpack.tf/profiles/76561198205349677#!/compare/1586908800/1587168000

Sold for 7 keys

Sale 4:

https://backpack.tf/profiles/76561198101261826#!/compare/1585612800/1591228800

https://backpack.tf/profiles/76561198237040276#!/compare/1588118400/1592092800

Untrace

Sale 5:

https://backpack.tf/profiles/76561198305676157#!/compare/1585872000/1585958400

https://backpack.tf/profiles/76561198352511434#!/compare/1585958400/1586044800

7 keys pure.

Sale 6:

https://backpack.tf/profiles/76561198128160169#!/compare/1587340800/1588118400

https://backpack.tf/profiles/76561198885102216#!/compare/1588032000/1588118400

Untrace

Sale 7:

https://backpack.tf/profiles/76561198885102216#!/compare/1589846400/1592438400

https://backpack.tf/profiles/76561198168863803#!/compare/1592352000/1592438400

Backpack Sale - Bulk

Sale 8:

https://backpack.tf/profiles/76561198370509151#!/compare/1585785600/1586649600

https://backpack.tf/profiles/76561198987544944#!/compare/1585872000/1589414400

Unknown / bulk

Summary of Sales:

3 @ 7 keys

1 @ 15 keys - Obvious outlier / way above sell orders.

Taking 7 keys.