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

First suggestion, made by Mikey!

Marketplace Sales:

https://marketplace.tf/items/tf2/1114;5;u3015

1: https://backpack.tf/item/3341496557

Apr 30th - $19.80

Keys were $1.82, so 19.80 / 1.82 = 10.88, rounding to 11 keys.

2: Can't determine history.

May 2nd - $26.67

Keys were $1.87, so 26.67 / 1.87 = 14.26, rounding to 14 keys.

3: Can't determine history.

May 9th - $22.70

Keys were $1.89, so 22.70 / 1.89 = 12.01, rounding to 12 keys.

4: https://backpack.tf/item/5221764342

May 29th - $22.70

Keys were $1.94, so 22.70 / 1.94 = 11.7, rounding to 12 keys.

Other Sales:

1: https://backpack.tf/item/3102994171

https://backpack.tf/profiles/76561198311498888#!/compare/1588032000/1588118400

https://backpack.tf/profiles/76561198152299329#!/compare/1586131200/1588291200

Untrace

2: https://backpack.tf/item/3102994171

https://backpack.tf/profiles/76561198045229222#!/compare/1588204800/1589587200

https://backpack.tf/profiles/76561198152299329#!/compare/1588291200/1588982400

Untrace

3: https://backpack.tf/item/3204052624

https://backpack.tf/profiles/76561198311498888#!/compare/1590537600/1590624000

https://backpack.tf/profiles/76561198396576035#!/compare/1590537600/1590624000

Untrace

4: https://backpack.tf/item/3204052624

https://backpack.tf/profiles/76561198189381361#!/compare/1590883200/1590969600

https://backpack.tf/profiles/76561198954470051#!/compare/1590883200/1590969600

9 keys pure. Quicksell (Sold in < 48 hours at 0.5 keys above buy orders)

5: https://backpack.tf/item/5221764342

https://backpack.tf/profiles/76561198454615761#!/compare/1588550400/1588723200

https://backpack.tf/profiles/76561198084635414#!/compare/1588550400/1588723200

https://i.imgur.com/zYte9BL.png - I bought it way back then.

12 keys pure.

6: https://backpack.tf/item/5221764342

https://backpack.tf/profiles/76561198871163068#!/compare/1588723200/1588896000

https://backpack.tf/profiles/76561198084635414#!/compare/1588723200/1588896000

Untrace, my quickselling of it because I'm terrible with impulse control.

7: https://backpack.tf/item/3343674079

https://backpack.tf/profiles/76561198454615761#!/compare/1588809600/1588896000

https://backpack.tf/profiles/76561198070768759#!/compare/1585094400/1590364800

Untrace

Summary of sales:

[s]1 @ 9 keys[s] - Quicksell, excluding

1 @ 11 keys

3 @ 12 keys

1 @ 14 keys

11-14 keys.