Resuggestion, thanks to Cashew for the info!

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

55th suggestion, made by Astimageon!

Trade 1:

https://backpack.tf/profiles/76561198059395448#!/compare/1588723200/1591142400

https://backpack.tf/profiles/76561198279670065#!/compare/1588809600/1589068800

12 keys.

Trade 2:

https://backpack.tf/profiles/76561198270949034#!/compare/1588723200/1588809600

https://backpack.tf/profiles/76561198834678807#!/compare/1588723200/1589414400

Untrace

Trade 3:

https://backpack.tf/profiles/76561198358181236#!/compare/1589241600/1589500800

https://backpack.tf/profiles/76561198270949034#!/compare/1589155200/1589241600

Untrace

Trade 4:

https://backpack.tf/profiles/76561198236669300#!/compare/1589155200/1589241600

https://backpack.tf/profiles/76561198358181236#!/compare/1591401600/1592438400

Untrace

Trade 5:

https://backpack.tf/profiles/76561198986747837#!/compare/1589328000/1589414400

https://backpack.tf/profiles/76561198236669300#!/compare/1589241600/1589328000

Untrace

Trade 6:

https://backpack.tf/profiles/76561198986747837#!/compare/1589414400/1589500800

https://backpack.tf/profiles/76561198850274253#!/compare/1589414400/1589500800

Untrace

Trade 7:

https://backpack.tf/profiles/76561198101300189#!/compare/1589760000/1589932800

https://backpack.tf/profiles/76561198037674114#!/compare/1587254400/1589932800

Untrace

Trade 8:

https://backpack.tf/profiles/76561198850274253#!/compare/1591142400/1591228800

https://backpack.tf/profiles/76561198037674114#!/compare/1591142400/1591315200

Untrace

Sale 9:

https://marketplace.tf/items/tf2/30082;5;u56

$40 / $1.89 = 21.16 keys

$40 / $1.90 = 21.05 keys

$13.7 / $1.90 = 7.21 keys

$30 / $1.94 = 15.46 keys

Total sales @:

7, 12, 15, 21, 21 keys

buyers up to ~9 keys,

given seller at 15 keys,

https://bot.tf/stats/listings/MQ0JN05P

calling 21 high,

taking 12 - 15 keys

Cashew's Part:

https://bot.tf/stats/listings/Y80W9XQW b/o 15 for sale 1

the fubar fanfare was also added - https://backpack.tf/item/4953253069

puts the 12 key sale at 13 keys.

Taking 13 - 15 keys.