Team 1
Day 3

Hellish Inferno Flippin Awesome

Sale 1 : https://backpack.tf/profiles/76561198305676157#!/compare/1561507200/1561680000
Untrace

Sale 2 : https://backpack.tf/profiles/76561198218497692#!/compare/1564358400/1564617600
Sold for 4 keys? Maybe cash ?

Sale 3 : https://backpack.tf/profiles/76561198132113819#!/compare/1560384000/1560556800
Untrace

Sale 4 : https://backpack.tf/profiles/76561197973696367#!/compare/1560297600/1560470400
Untrace

MP.TF sales:

Sold for 39.99$ on Jun 21, keys at that time : 1.84 = 21.73 keys ~ rounding to 22 keys
https://manic.tf/keyprice/?at=2019-06-21
History : https://backpack.tf/item/5202999249
Sold for 28.79$ on Jun 15, keys at that time : 1.82 = 15.82 keys ~ rounding to 16 keys
https://manic.tf/keyprice/?at=2019-06-14
History : Not found.

Going with 16-22 keys.