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

13th suggestion, made by Mikey!

Marketplace Sales:

https://marketplace.tf/items/tf2/1119;5;u3015

1:

https://backpack.tf/item/5061095197

May 28th - $17.00

Keys were $1.91 that day, so 17 / 1.91 = 8.9 keys, rounding to 9.

2:

Can't find item history.

June 10th - $19.90

Keys were $2.01 that day, so 19.90 / 2.01 = 9.9 keys, rounding to 10.

3:

Can't find item history.

June 21st - $19.00

Keys were $1.99 that day, so 19.00 / 1.99 = 9.55 keys, rounding to 9.5.

Other Sales:

4:

https://backpack.tf/profiles/76561198311498888#!/compare/1589760000/1589846400

https://backpack.tf/profiles/76561198155999450#!/compare/1589846400/1589932800

9 keys and 30.33 refined, rounding to 9.5 keys.

5:

https://backpack.tf/profiles/76561198354325293#!/compare/1554508800/1554940800

https://backpack.tf/profiles/76561198044684270#!/compare/1554508800/1555027200

Untrace

6:

https://backpack.tf/profiles/76561198026360445#!/compare/1592265600/1592352000

https://backpack.tf/profiles/76561198154268023#!/compare/1592092800/1592265600

Bulk

7:

https://backpack.tf/profiles/76561198115381172#!/compare/1589846400/1590019200

https://backpack.tf/profiles/76561198308042551#!/compare/1587600000/1590192000

8 keys pure.

Summary of Sales:

1 @ 8 keys

1 @ 9 keys

2 @ 9.5 keys

1 @ 10 keys

Taking 8-10 keys.