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

46th suggestion, made by Mikey!

Sale 1:

https://marketplace.tf/items/tf2/30762;5;u3015

Can't find item history.

May 17th - $30.00

Keys were $1.94 that day, so 30 / 1.94 = 15.46 keys, rounding to 15.

Sale 2:

https://backpack.tf/profiles/76561198818035498#!/compare/1585526400/1585612800

https://backpack.tf/profiles/76561198335791307#!/compare/1585440000/1585526400

6 Keys - Quicksell. (likely more)

Sale 3:

https://backpack.tf/profiles/76561198150200238#!/compare/1588377600/1589241600

https://backpack.tf/profiles/76561198305676157#!/compare/1588809600/1588896000

11 keys + 5 refined, rounding to 11 keys.

1 sale @ 11 keys

1 sale @ 15 keys - Listing at 13 keys unsold for 16 days.